carb fuel filter ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Daves72'GMC · 12-18-2008, 02:01 PM

I have a couple of ?'s about the fuel filter that goes from the fuel pump to the carb?Where should this filter be located above the valve cover or above the fuel pump in front of the engine? I bought my filter from summit and it screws together and I discovered it was leaking yesterday and I tried to tighten it up and it still leaks, any suggestions on how to fix or should I use a different kind of filter? What is the best kind of fuel filter to use, a sealed one that doesn't screw together? Thank you. Dave

Stock72c10 · 12-18-2008, 04:23 PM

I would put it where it doesn't leak on the exhaust manifold if there is ever a problem. My fuel filter is in the carb, so I can't help you on the best inline type. I like clear ones on my tractor though so I can see what's going on.

JimKshortstep4x4 · 12-18-2008, 06:45 PM

Here is a picture of where I located mine on a big block. I have installed the small block filters in the same area.

I am not sure about your leak. Is it the type of filter that is in line like the one in my picture?

Jim

texanidiot25 · 12-18-2008, 07:53 PM

I use the filter in my q-jet carb, and currently have a clear fram (find it at walmart) one on the rubber line between the gas tank and the hard lines on the frame, while the new tank gets new gas and washes out any rust left inside.

Daves72'GMC · 12-18-2008, 08:21 PM

I have an edelbrock 750cfm carb. with 3/8 rubber fuel line. with a metal filter that I bought from summet that screws together and leaks.

badpeanut · 12-18-2008, 08:47 PM

Quote:

Originally Posted by JimKshortstep4x4

Here is a picture of where I located mine on a big block. I have installed the small block filters in the same area.

I am not sure about your leak. Is it the type of filter that is in line like the one in my picture?

Jim

Nice looking and safe! Where did you get the fuel filter?

JimKshortstep4x4 · 12-19-2008, 05:09 AM

I picked the filter up at NAPA. I run the external filter and leave the Q-Jet carb filter in place.

The filter has female fittings on both ends, (3/8" thread).

Jim

badpeanut · 12-19-2008, 08:48 AM

Quote:

Originally Posted by JimKshortstep4x4

I picked the filter up at NAPA. I run the external filter and leave the Q-Jet carb filter in place.

The filter has female fittings on both ends, (3/8" thread).

Jim

Thanks, I'll check at Napa!

Did you have to flare the ends of the fuel line also?

Huck · 12-19-2008, 10:35 AM

Best filter location is between the tank and pump. Not under pressure and any leak will not put gas into the engine, exhaust manifold, or firewall. See newer trucks and they all have the filter cradled inside the frame usually behind the location of the cat converter. Most engine fires come from leaking fuel filter, rubber hose line above the intake manifold. If a filter starts to leak on top of or in front of the engine--guess what happens. Huck

sneakysnake · 12-19-2008, 10:48 AM

Also if possible mount the filter horizonal, it helps to trap water like a settling bowl.

badpeanut · 12-19-2008, 07:33 PM

Quote:

Originally Posted by Huck

Best filter location is between the tank and pump. Not under pressure and any leak will not put gas into the engine, exhaust manifold, or firewall. See newer trucks and they all have the filter cradled inside the frame usually behind the location of the cat converter. Most engine fires come from leaking fuel filter, rubber hose line above the intake manifold. If a filter starts to leak on top of or in front of the engine--guess what happens. Huck

I do agree a fire is less likely with the fuel filter away from the engine. However, on carburated vehicles GM always put the fuel filter between the pump and carb (worthless filter at the carb) placing it downstream of the pump. On newer fuel injected vehicles as you describe the fuel filter is cradled inside the frame (between the in-tank fuel pump and engine, placing it downstream of the pump). From what I've read placing the fuel filter upstream of the pump can cause some issues with air and starvation. Mounting a metal fuel filter using all hard lines between the fuel pump and carb as pictured appears to me to be the best way to go (gets away from scarry things like rubber hose downstream of the pump and glass fuel filters).

JimKshortstep4x4 · 12-19-2008, 08:41 PM

badpeanut,

I bent the line and flared the ends. It was pretty easy to do. I don't like the rubber hoses as had been mentioned.

Jim

texanidiot25 · 12-19-2008, 08:53 PM

Quote:

Originally Posted by badpeanut

I do agree a fire is less likely with the fuel filter away from the engine. However, on carburated vehicles GM always put the fuel filter between the pump and carb (worthless filter at the carb) placing it downstream of the pump. On newer fuel injected vehicles as you describe the fuel filter is cradled inside the frame (between the in-tank fuel pump and engine, placing it downstream of the pump). From what I've read placing the fuel filter upstream of the pump can cause some issues with air and starvation. Mounting a metal fuel filter using all hard lines between the fuel pump and carb as pictured appears to me to be the best way to go (gets away from scarry things like rubber hose downstream of the pump and glass fuel filters).

One reason it's placed after the tank in newer trucks is because the pump is in the gas tank, so naturally the filter is out where it's easy to access. But when it comes to placement, my dad said last weekend that when placing filters before the mech. pump on our trucks, they sometimes tend to collapse from the suction of the pump.

**PICKMUP** · 12-19-2008, 10:50 PM

I learned on my race cars that steel braided hose with AN fittings is the best way to go for trouble-free gas lines. No flares to leak and easy tightening. They look cool, too.

Daves72'GMC · 12-23-2008, 06:48 PM

Hi , I tried to put the metal edelbrock setup on in the past and it hits the a/c bracket on the intake manifold and didn't work , so if I stay with the rubber fuel line,which is better between the tank and fuel pump or in the engine compartment and (where in the engine compartment)? Thank you. Dave

michael bustamante · 12-23-2008, 07:14 PM

quick word of advice. I dont know if theyre still available but they used to sell glass aftermarket fuel filters. stay away from these!!, ive seen where they crack and leak on a hot engine block. could be catastraughic!!

Longhorn Man · 12-23-2008, 07:59 PM

I usually stay away from parts that cause fires. However...
A glass filter that is properly secured, won't break, period. (excluding accidents or morons tossing thingson top o the motor)
A hose clamp properly clamped, on a hose that is properly inspected from time to time, won't be an issue either.
A filter should be on the pressurized part of the fuel line. If it is on the vacuum side, then this lowers the boiling point... which boiling fuel is called vapor lock, and can lead to walking home. Putting the filter on the vacuum side also increases the work the pump is needed to do.
I am honestly amazed at how many people on here comment on leaking fuel filters. Put it on, do it right, tighten everything down, and it should be good.
If you want to be super safe, and don't like rubber in the fuel line (like they did from the factory... under the cab over the exhaust pipe) then do something like the first photo, or the AN stuff that was posted further down. if going the route of the first photo, you can get smaller filters that aren't as ugly and in the way, and even place them over the intake for ease of service. Again, you'll want to secure the line, as a line is not supposed to support its self and can split from vibrations... and those metal filters aren't real strong either, so you'll want to make sure it doesn't vibrate against anything also.

Daves72'GMC · 12-23-2008, 09:35 PM

Can you please post some pics of the filter with rubber fuel lines and how you secure them? thank you. I'd really appreciate it. Thank you.Dave

eric72 · 12-23-2008, 09:44 PM

hey jimkshortstep4x4 could you get a part number off your filter i can't seem to find them.
Thanks Eric

big_al_71 · 12-23-2008, 09:51 PM

here is a pict of my set up......

Brad · 12-24-2008, 12:38 AM

Quote:

Originally Posted by Longhorn Man

I usually stay away from parts that cause fires. However...
A glass filter that is properly secured, won't break, period. (excluding accidents or morons tossing thingson top o the motor)

I've had a glass filter on my vehicles for years and never had a problem. The key is to use good rubber gaskets (which are plentiful in the filter packages) and simply tighten them using your fingers. This will allow the glass to expand and not crack. Only use a wrench to loosen them for replacement.

**truckdude239** · 12-24-2008, 08:11 AM

i run a clear plstic inline filter from advance auto parts with 2 rubber hoses

**WorkinLonghorn** · 12-24-2008, 09:17 AM

Could comebody please explain to me why it is necessary or even desireable to SEE inside the filter? I've somehow made it by all these years just assuming the gas was moving on through there and when it wasn't,It was easy enough to figure out.
I was given a vehicle once that had the see-through filter on the front of the engine and when a fan belt broke it took out the little POS see-through filter and burned up the engine compartment.
Just get a good quality metal filter and like LM says inspect the fittings once in a while.

12-18-2008, 02:01 PM	#1
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	carb fuel filter ? I have a couple of ?'s about the fuel filter that goes from the fuel pump to the carb?Where should this filter be located above the valve cover or above the fuel pump in front of the engine? I bought my filter from summit and it screws together and I discovered it was leaking yesterday and I tried to tighten it up and it still leaks, any suggestions on how to fix or should I use a different kind of filter? What is the best kind of fuel filter to use, a sealed one that doesn't screw together? Thank you. Dave

12-18-2008, 04:23 PM	#2
Stock72c10 classic=of recognized value Join Date: Sep 2008 Location: Wichita, KS Posts: 317	Re: carb fuel filter ? I would put it where it doesn't leak on the exhaust manifold if there is ever a problem. My fuel filter is in the carb, so I can't help you on the best inline type. I like clear ones on my tractor though so I can see what's going on.

12-18-2008, 06:45 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: carb fuel filter ? Here is a picture of where I located mine on a big block. I have installed the small block filters in the same area. I am not sure about your leak. Is it the type of filter that is in line like the one in my picture? Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC Last edited by JimKshortstep4x4; 07-14-2009 at 12:54 PM.

12-18-2008, 07:53 PM	#4
texanidiot25 Eat My Rust Join Date: Jan 2007 Location: Cypress, Texas Posts: 3,362	Re: carb fuel filter ? I use the filter in my q-jet carb, and currently have a clear fram (find it at walmart) one on the rubber line between the gas tank and the hard lines on the frame, while the new tank gets new gas and washes out any rust left inside.

12-18-2008, 08:21 PM	#5
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	Re: carb fuel filter ? I have an edelbrock 750cfm carb. with 3/8 rubber fuel line. with a metal filter that I bought from summet that screws together and leaks.

12-19-2008, 05:09 AM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: carb fuel filter ? I picked the filter up at NAPA. I run the external filter and leave the Q-Jet carb filter in place. The filter has female fittings on both ends, (3/8" thread). Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-19-2008, 10:35 AM	#9
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	Re: carb fuel filter ? Best filter location is between the tank and pump. Not under pressure and any leak will not put gas into the engine, exhaust manifold, or firewall. See newer trucks and they all have the filter cradled inside the frame usually behind the location of the cat converter. Most engine fires come from leaking fuel filter, rubber hose line above the intake manifold. If a filter starts to leak on top of or in front of the engine--guess what happens. Huck Last edited by Huck; 12-19-2008 at 10:37 AM. Reason: forgot something

12-19-2008, 10:48 AM	#10
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: carb fuel filter ? Also if possible mount the filter horizonal, it helps to trap water like a settling bowl.

12-19-2008, 08:41 PM	#12
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: carb fuel filter ? badpeanut, I bent the line and flared the ends. It was pretty easy to do. I don't like the rubber hoses as had been mentioned. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-19-2008, 10:50 PM	#14
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,123	Re: carb fuel filter ? I learned on my race cars that steel braided hose with AN fittings is the best way to go for trouble-free gas lines. No flares to leak and easy tightening. They look cool, too. Attached Images Last edited by PICKMUP; 12-19-2008 at 11:02 PM. Reason: pic

12-23-2008, 06:48 PM	#15
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	Re: carb fuel filter ? Hi , I tried to put the metal edelbrock setup on in the past and it hits the a/c bracket on the intake manifold and didn't work , so if I stay with the rubber fuel line,which is better between the tank and fuel pump or in the engine compartment and (where in the engine compartment)? Thank you. Dave

12-23-2008, 07:14 PM	#16
michael bustamante Registered User Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,841	Re: carb fuel filter ? quick word of advice. I dont know if theyre still available but they used to sell glass aftermarket fuel filters. stay away from these!!, ive seen where they crack and leak on a hot engine block. could be catastraughic!! __________________ 1967custom

12-23-2008, 07:59 PM	#17
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: carb fuel filter ? I usually stay away from parts that cause fires. However... A glass filter that is properly secured, won't break, period. (excluding accidents or morons tossing thingson top o the motor) A hose clamp properly clamped, on a hose that is properly inspected from time to time, won't be an issue either. A filter should be on the pressurized part of the fuel line. If it is on the vacuum side, then this lowers the boiling point... which boiling fuel is called vapor lock, and can lead to walking home. Putting the filter on the vacuum side also increases the work the pump is needed to do. I am honestly amazed at how many people on here comment on leaking fuel filters. Put it on, do it right, tighten everything down, and it should be good. If you want to be super safe, and don't like rubber in the fuel line (like they did from the factory... under the cab over the exhaust pipe) then do something like the first photo, or the AN stuff that was posted further down. if going the route of the first photo, you can get smaller filters that aren't as ugly and in the way, and even place them over the intake for ease of service. Again, you'll want to secure the line, as a line is not supposed to support its self and can split from vibrations... and those metal filters aren't real strong either, so you'll want to make sure it doesn't vibrate against anything also.

12-23-2008, 09:35 PM	#18
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	Re: carb fuel filter ? Can you please post some pics of the filter with rubber fuel lines and how you secure them? thank you. I'd really appreciate it. Thank you.Dave

12-23-2008, 09:44 PM	#19
eric72 Registered User Join Date: Dec 2003 Location: georgia Posts: 212	Re: carb fuel filter ? hey jimkshortstep4x4 could you get a part number off your filter i can't seem to find them. Thanks Eric Last edited by eric72; 12-23-2008 at 09:45 PM.



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12-23-2008, 09:51 PM	#20
big_al_71 Registered User Join Date: Jun 2008 Location: South Florida Posts: 11,375	Re: carb fuel filter ? here is a pict of my set up...... Attached Images __________________ Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild

12-24-2008, 08:11 AM	#22
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,228	Re: carb fuel filter ? i run a clear plstic inline filter from advance auto parts with 2 rubber hoses __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-24-2008, 09:17 AM	#23
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: carb fuel filter ? Could comebody please explain to me why it is necessary or even desireable to SEE inside the filter? I've somehow made it by all these years just assuming the gas was moving on through there and when it wasn't,It was easy enough to figure out. I was given a vehicle once that had the see-through filter on the front of the engine and when a fan belt broke it took out the little POS see-through filter and burned up the engine compartment. Just get a good quality metal filter and like LM says inspect the fittings once in a while. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

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