Roadside fuel pressure regulator help needed. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 12-06-2016, 04:28 PM

I'm helping a friend get a P30 chassis 1984 motorhome down the road and we have run into a huge problem. It's a 454 with a quadrajet that I rebuilt yesterday. It has an electric Carter fuel pump in the rear and a brand new mechanical pump on the motor. The carb is being inundated with fuel as its coming out of the top of the carb. We stopped by a parts store and got a cheap spectre pressure regulator. It doesn't work, filled a water bottle up in a few seconds on the lowest setting. I tore the carb back down, lowered the float to 3/8 below the carb body. Even with the mechanically pump bypassed, it still floods the carb. We're thinking of bypassing the electric pump and seeing if the mechanically pump candidate get fuel to the front. Any suggestions?

geezer#99 · 12-06-2016, 05:22 PM

Did you hang the needle clip on the float correctly?
Common flooding problem if not done right.
Like in here.
http://www.crankshaftcoalition.com/w...4MV_carburetor

**TJ's Chevy** · 12-06-2016, 05:29 PM

What pump did you put in? Got a part number or link? Specs?

crm318 · 12-06-2016, 05:43 PM

I removed the clip. I run all of my quadrajets that way. If I put it back on, how does it go?

storm9c1 · 12-07-2016, 02:04 PM

Quote:

We stopped by a parts store and got a cheap spectre pressure regulator. It doesn't work, filled a water bottle up in a few seconds on the lowest setting.

I think you are confusing pressure with volume. The only way to measure pressure is on a closed system with a gauge. The pressure is what overcomes the needle valve, not volume. I'd plumb in a gauge to verify. I don't imagine that you need a regulator though.

I do agree that you may have a needle and seat problem.

crm318 · 12-08-2016, 01:44 AM

Turns out, there was an unseen sliver of aluminum in the seat. Removed it and it runs like a top. Thank you guys for the help.

12-06-2016, 04:28 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Roadside fuel pressure regulator help needed. I'm helping a friend get a P30 chassis 1984 motorhome down the road and we have run into a huge problem. It's a 454 with a quadrajet that I rebuilt yesterday. It has an electric Carter fuel pump in the rear and a brand new mechanical pump on the motor. The carb is being inundated with fuel as its coming out of the top of the carb. We stopped by a parts store and got a cheap spectre pressure regulator. It doesn't work, filled a water bottle up in a few seconds on the lowest setting. I tore the carb back down, lowered the float to 3/8 below the carb body. Even with the mechanically pump bypassed, it still floods the carb. We're thinking of bypassing the electric pump and seeing if the mechanically pump candidate get fuel to the front. Any suggestions? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

12-06-2016, 05:22 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: Roadside fuel pressure regulator help needed. Did you hang the needle clip on the float correctly? Common flooding problem if not done right. Like in here. http://www.crankshaftcoalition.com/w...4MV_carburetor

12-06-2016, 05:29 PM	#3
TJ's Chevy Post Whore Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	Re: Roadside fuel pressure regulator help needed. What pump did you put in? Got a part number or link? Specs? __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

12-06-2016, 05:43 PM	#4
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: Roadside fuel pressure regulator help needed. I removed the clip. I run all of my quadrajets that way. If I put it back on, how does it go? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

12-08-2016, 01:44 AM	#6
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: Roadside fuel pressure regulator help needed. Turns out, there was an unseen sliver of aluminum in the seat. Removed it and it runs like a top. Thank you guys for the help. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies



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