Fuel System. In tank or external? Baffling etc..
 

I'm at the stage in my build where I need to start putting together my fuel system. I have a 71 shortbed that i'm putting a 2006 Lq4 into.

I would like to relocate the fuel tank to the rear of the truck. Looking at options. Is it better to have an external or internal fuel pump?

My main concern with an inline pump such as a Bosch 044 is it starving due to baffling/not being able to mount it low enough for gravity to help feed it if the tank is less than 1/2 full. I do like the idea of having a pre filter and after filter on an external in line pump.

As for an internal pump, not sure how reliable they are and if they eliminate concerns for them starving for fuel.

Not sure which tank is the best option for internal and which tank is the best option for external.

I do not want a tank that is to low in the rear.

From experience what are the pros and cons to each setup?

Thanks in advance.

Re: Fuel System. In tank or external? Baffling etc..
 

All the OEM's put the pump in the tank, so that should say something... Only real down side to them is you usually have to pull the tank to change it, but that said, they last longer since they are cooled by the fuel and they are only pushing fuel and not pulling it which is harder on a pump.

Re: Fuel System. In tank or external? Baffling etc..
 

From experience anyone like a tank and particular pump setup?

Re: Fuel System. In tank or external? Baffling etc..
 

I've stuffed a Walbro GSS392 into my stock tank. Fit right through the sending unit hole. It's worth noting that an in tank pump on a tank not designed for one can still have fuel starvation issues while cornering.

I kept my in-cab fuel tank, but wouldn't do that if I did a swap all over again. Still has fuel fumes in the cab from time to time.

Re: Fuel System. In tank or external? Baffling etc..
 

I used a 1990 jeep wrangler gas tank and made brackets to mount under the bed. The tank is internally baffled. I used an 87 blazer sending unit and walbro 255 fuel pump. I modified the tank inlet location a bit for my setup.

It was a bit of custom work for brackets and tank inlet location but it fits well and is not seen below the bumper.

Re: Fuel System. In tank or external? Baffling etc..
 

compsystems, what did it take to make the sending unit and pump fit? How big is the tank?

Re: Fuel System. In tank or external? Baffling etc..
 

the tank is 15 gallons. Its a little small but its the best option the tucks up into the frame. I used angle iron to make a square bracket the fit the space between the frame opening and tank.

The walbro is a bolt in install into the 87 blazer sending unit, no modification required. The sending unit is a drop in fit into the jeep tank with O-ring and lock nut. You will only need to get adapters to fit the metric thread of the sending unit to your fuel hose fittings of choice.

I went with -8 AN line feed and -6 AN line return.

Gas tank = $65
Blazer sending unit =$65
Walbro pump = $130

You will have to modify the tank for your fill location.
Bed fill \ fender fill\ ect...

Re: Fuel System. In tank or external? Baffling etc..
 

In tank pump built for fuel injection is the best way to go.:chevy:

Re: Fuel System. In tank or external? Baffling etc..
 

I hope some more people chime in on there tank and pump setups and if they have any issues with it? Starvation and irregular fuel tank level readings.

Re: Fuel System. In tank or external? Baffling etc..
 

In tank and baffled.

Re: Fuel System. In tank or external? Baffling etc..
 

What brand tanks and fuel pumps?

Re: Fuel System. In tank or external? Baffling etc..
 

External, sumped, no baffles (tank foam). 16 gal cel.

Overall, has been solid for like 4 years at least. Haven't killed a pump yet, I drive ~42lb injectors, so its put some work in.

Only problem is tank foam was actually from pre-swap and is starting to get a little old. On extremely hard stopping when ~1/4 tank or less, it'll starve a little (like going 75-0 on a really short off ramp). Not always, and not usually all the way, but you see it in a log. I'm looking at switching to using a Fuel-mat, but haven't commited yet.

Re: Fuel System. In tank or external? Baffling etc..
 

Looking at the BOYD welding tank and the ece efi tank. Anyone have any pros and cons to either? Besides price? Anyone driven around with either tank? Any issues full or 1/4 tank. These tank are expensive.

Re: Fuel System. In tank or external? Baffling etc..
 

I have used both and both are quality products. I have had no issues with 1/4 tank driving.

Re: Fuel System. In tank or external? Baffling etc..
 

I am using one of Boyds first tanks with the EFI in-tank fuel pump.
I say it is one of the first because I believe he has since improved his baffling. Currently I need to work on this for my truck. It doesn't work as well as I think it could as it is. I am not bad mouthing this as it fits great and looks great. Most of the time I have no issues however under hard acceleration and under half a tank it gives me problems.
I am going to contact him and see if there are any suggestions.
I have seen the fuel mat Brew mentions and that may be a direction but I am unsure what baffling is in the tank now.

Re: Fuel System. In tank or external? Baffling etc..
 

And to add to this prior to this tank I had a poly blazer tank mounted in back with an external pump. First it didn't look very good as it hung down quite a bit and I did have a pump go out on me. I had been on the power tour and was returning home so it had been stressed quite a bit with the heat. My trip home was 15 or so hours of straight driving and about 10 hours into it i started fighting it. I had to make several stops the rest of the trip for cool down but I did drive it home with no real problems. I swapped the pump until I could afford a nice tank.
Like others have said I think the in-tank pump is the best way to go It keeps cooler.
I have had this swap in for 11 or 12 years so either will work.

Re: Fuel System. In tank or external? Baffling etc..
 

Thank you for the replies guys. I just want to make sure if I drop $700+ on a tank and pump setup that it has 0 issues. I think that's a reasonable expectation

Re: Fuel System. In tank or external? Baffling etc..
 

I'm running stock tank,, no baffle or foam,, walbro 255 external, vette filter/reg..I've run my tank level down very low and never had any starvation issues..I may have just got lucky though..in tank is probably best..as already stated the factory setups are that way.

Re: Fuel System. In tank or external? Baffling etc..
 

A Bosch 044 can and regularly is used as an in-tank pump. For an average LS motor it is overkill though.

Re: Fuel System. In tank or external? Baffling etc..
 

So many factors to ever know for sure. My cell is mounted center and VERY low, but I also have an extremely loose suspension compared to guys on stiff springs and low pro rims. My truck transfers a lot of weight front to rear, and I probably change the height of my cell more drastically than most guys. I can probably lift my rear end 6" if I locked up the front brakes (need to limit that in the new suspension).

Too Much = never enough. :metal:

Re: Fuel System. In tank or external? Baffling etc..
 

Does anyone have any experience with aluminum cracking or ripping? Trying to see if stainless is really worth the extra cost. Truck will be driven maybe 3 or 4 times a month a short distance

Re: Fuel System. In tank or external? Baffling etc..
 

Mine is a 42 gallon Suburban tank inside the bed under my fiberglass cover. it sit's right behind the cab and it was for a TBI fuel injection pump to start with. All I did was swap the pump out for the TPI motor and now for the LS motor.
You can use the foam but as stated it will start coming a part later on. The best solution is a tank made for this app.
I can't see anything wrong with the Aluminum tank as far as normal use. The steal will be a bit more stronger maybe.
The thing I don't like about aluminum is the threads are bad to strip and on SS they are bad to galling. :chevy:

Re: Fuel System. In tank or external? Baffling etc..
 

For a smaller cell, aluminum is nice just from a weight perspective. I don't mind the poly cells, but they don't usually take the "best" advantage of the room available, and you can't put your fittings at will.

Anyone know what those big 100 gallon bed-mounted extended range tanks the diesel guys use are made of? I have no idea.

Re: Fuel System. In tank or external? Baffling etc..
 

Brew if your talking about those in the bed diesel tanks.. a buddy of mine has 2 in 2 different trucks ,one is a stand alone tank and its made of 1/8" steel ..the other is a toolbox/tank combo and its all aluminum.

Re: Fuel System. In tank or external? Baffling etc..
 

All the bed tanks I looked at where for non flamable liquids. In other words no gas! I was surprised. The tool box tanks I would think are cool and hidden which I liked.:chevy:

Re: Fuel System. In tank or external? Baffling etc..
 

What they heck else would you need a bed tank for? Water?
I'm thinking the big transfer tanks, the ones that even have a gas pump ON them for farms and stuff.

Re: Fuel System. In tank or external? Baffling etc..
 

Ours are steel and used for refueling tractors, bulldozers and other equipment. The electric pump is right on the tank.

Re: Fuel System. In tank or external? Baffling etc..
 

I've used a Bosch 044 external on a few swaps. Always worked well. Kept the tank above 1/4 tank. Never a problem.

Having said that on my 98 Wrangler LS6 swap. Eight years on a Walbro 255 intank with a Corvette FFR and again never a hiccup.

Re: Fuel System. In tank or external? Baffling etc..
 

Product Summary:

14-gauge steel tank features a durable, powder-coat finish, lockable cap, reinforced bung and much more. Baffles add strength while preventing the contents from shifting too quickly. Not intended for use with gasoline.


http://www.northerntool.com/shop/too...FUEehgod5MgHdg


http://www.wayfair.com/Lund-Inc.-18-...1203.html?PiID[]=9409481

Information:

The Tradesman TVST50 50-Gallon Full-Mid Size Vertical Liquid Storage Tank is recommended for construction and agricultural use. Designed to accommodate any size of Tradesman's cross bed boxes, this tank comes with base mounting tabs and baffles to provide an even flow of liquid. This storage tank is not intended for transferring gasoline or other flammables and should be not be used as an auxiliary fuel tank. It does not meet DOT specifications. Made with 14-gauge steel.

This site has DOT tanks.

http://www.atitank.com/products/dot-refueling-tanks

Re: Fuel System. In tank or external? Baffling etc..
 

What ohm sending unit works best ? I will probably go with after market saints digital style gauges

Re: Fuel System. In tank or external? Baffling etc..
 

Jeep Tank, but I had bought an unbaffled for the carb setup. I cut the top ring out of a plastic oem 03 truck gas tank, made a ring to reinforce the underside, and cut a hole in the Jeep tank and used the shortened pickup bucket with the stock pump and a Vette FFR. Like a bandit. They sell a 91 wrangler tank with the FI baffles, then use the shortened 87 PU stuff. I was just sweating the baffles. There are pics in my new heart thread.

Re: Fuel System. In tank or external? Baffling etc..
 

I just ordered a 64-68 F*** Mus***g tank from Tanks Inc along with their in tank pump and I am pretty excited to get it and get it in. All i have been able to find on it is one guy putting it in. And judging by his photos I don't know why everyone isn't doing it. The tank i ordered is baffled for efi and it takes a standard 5 bolt sending unit. The tank P/N is MU-T.

http://67-72chevytrucks.com/vboard/a...1&d=1357094227

http://67-72chevytrucks.com/vboard/a...1&d=1357094227

Re: Fuel System. In tank or external? Baffling etc..
 

I purchased an ECE stainless tank. Not cheap but no regrets. Fits like a glove and well made. Fuel pump inside the tank keeps the pump cool, is quieter, and as far as safety goes is better. I didn't want the tank behind my back. With the pump inside the tank it's one less item outside the tank to leak after a crash, and fewer fittings.

Re: Fuel System. In tank or external? Baffling etc..
 

I just posted about this but I'm hoping to run a stock style unit with built in regulator, filter, and sender like this:

Amazon.com: ACDelco MU1657 GM Original Equipment...
I have no idea how one would go about mounting it on a tank though. You don't need a baffled tank with these because there's a jet that keeps the bucket filled with fuel.

A bit more info http://www.gearhead-efi.com/gm-ecm-p...onversion.html

Re: Fuel System. In tank or external? Baffling etc..
 

Below is the response I received from Boyd's on starvation issues and vent clearance.

Originally Posted by Vandals909
Thinking about one of your tanks with EFI for my 71 with a chevy ls motor. i'm worried about what some have said about fuel starvation when the tank is under 1/4.

Also they say you have to trim the bed cross rail for the rollover vent?

Most concerned about spending $600 plus and havin starvation issues.

Both of those issues have been resolved. we have substantially increased the baffling so starvation issues are no longer a concern. the rollover vent has been relocated to ensure clearance of the lower bed cross member.


*** I have not gotten a response if there will be a discount member group buy anytime soon.

Re: Fuel System. In tank or external? Baffling etc..
 

Is this the sending unit you used? Amazon.com: Spectra Premium FG12L Sending Unit...
And it looks like the tank's filler might clear the frame rail for a side fill... true?

Re: Fuel System. In tank or external? Baffling etc..
 

keep us updated on the mustang tank,

thats pretty cool

Re: Fuel System. In tank or external? Baffling etc..
 

Looks slick, what are you going to do with the filler? Would you be able to get the filler out behind the license plate? Bit hard to tell from the pics. I need a tank that will work with a frame mounted hitch and a filler that is *not* in the bed.

Re: Fuel System. In tank or external? Baffling etc..
 

After running external pumps for the past 10 years, I finally modified my tank and added an Aeromotive Phantom setup....OMG....it's great.

https://aeromotiveinc.com/products-p.../phantom-flex/

Still have my twin external sumped Holleys for extra fuel in boost, but for day to day driving....I don't need to stop and fuel up at 1/4 tank anymore for fear of tearing up my fuel pumps from starvation.

https://aeromotiveinc.com/wp-content...x-1024x680.jpg

Re: Fuel System. In tank or external? Baffling etc..
 

I'm looking into piecing the same kind of setup together for my build, but at 1/5 of the cost -- I'll be using a cheaper pump though because I don't plan to exceed 600hp.

My setup will look like this:

'87 Wrangler tank - $60
Bolt-in Pickup assembly + Gasket - $40
KEMSO 340LPH pump - $40
External Filter/Regulator - $33
Misc. wires & connectors - $10

So, about $120 for the pump assembly, and maybe $200 with the tank, fuel line to the rail, fuel filler setup, and a fabbed bucket if the tank isn't baffled.

I'd even like to mount the filter/regulator in the tank assembly as well if external corrosion won't be an issue. This would save me some $ also because then I could use a cheaper singe line pickup.

Then if I need more flow later I can always drop in a replacement pump and still use the rest of the setup.