fuel pressure question

Hayden · 04-27-2008, 07:08 PM

I took out a 4.3 and threw in an older 350 in my 94 K-1500 W/T..I left the electric fuel pump in the tank and the 350 thats in it has a holley carb. the 350 also has the external fuel pump on the engine which I used new tranny lines to bridge the gap between the fuel feed and the fuel return lines..I was wondering if that pump is pushing to much pressure. The 4.3 was not the CPI vortech so I know it's not pushing the 50- 60 psi..I think this pump is pushing more like 14-16 psi which I know is to much for the holley but will the engines fuel pump reduce that pressure down any or should I try to get a pressure regulator or find just a non electrical pick up for the gas tank. heres some picks. it is dark out so these arent the best pics

http://img.photobucket.com/albums/v3...n/DSC00052.jpg

http://img.photobucket.com/albums/v3...n/DSC00050.jpg

brad4eva · 04-28-2008, 03:00 AM

You got to few pumps pushing 2 much pressure, Pull the relay on the one in tank, easy theres a relay center or w/e its calledcomes off with 3 lil screw black caps on the firmwall

Chevy_Finatic79 · 04-28-2008, 06:13 AM

I would get an adjustable in line fuel pressure regulator they arent that expensive and you can adjust to find your ideal pressure for the holley I think between 6-9 P.S.I.

87c10slammer · 04-28-2008, 07:51 AM

yeah i would go with that idea. i am doing the same to my c10. i paid like 50 bucks for a decent fuel pressure regulate

Chevy_Finatic79 · 04-28-2008, 08:19 AM

forgot to metion that "I think you need to have the fuel line regulated before it ever reaches the fuel pump mounted on the block"

87c10slammer · 04-28-2008, 01:10 PM

im not utilizing that pump. if you already have a electric pump all you need to do is get that regulator and put that between you carb electric pump. you dont need the pump on the block. i overlooked this on my first post sorry. you want to mount the regulator about 1 to 1.5 feet away from the carb in a spot you can easy adjust it. sorry i didnt write it sooner but i just breezed through the original post

Hayden · 04-28-2008, 02:19 PM

Thanks, I do have the plate that covers the engine blocks fuel pump. I'm also wondering if the pressure being so high right now is causing the engine to diesel.

87c10slammer · 04-30-2008, 04:05 AM

mor ethen likely it is spaying way to much gas and may soon hydrolock on you

04-27-2008, 07:08 PM	#1
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 387	fuel pressure question I took out a 4.3 and threw in an older 350 in my 94 K-1500 W/T..I left the electric fuel pump in the tank and the 350 thats in it has a holley carb. the 350 also has the external fuel pump on the engine which I used new tranny lines to bridge the gap between the fuel feed and the fuel return lines..I was wondering if that pump is pushing to much pressure. The 4.3 was not the CPI vortech so I know it's not pushing the 50- 60 psi..I think this pump is pushing more like 14-16 psi which I know is to much for the holley but will the engines fuel pump reduce that pressure down any or should I try to get a pressure regulator or find just a non electrical pick up for the gas tank. heres some picks. it is dark out so these arent the best pics http://img.photobucket.com/albums/v3...n/DSC00052.jpg http://img.photobucket.com/albums/v3...n/DSC00050.jpg __________________ There Is No Replacement For Displacement

04-28-2008, 06:13 AM	#3
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 485	I would get an adjustable in line fuel pressure regulator they arent that expensive and you can adjust to find your ideal pressure for the holley I think between 6-9 P.S.I. __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 327 Cu.In./THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

04-28-2008, 08:19 AM	#5
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 485	forgot to metion that "I think you need to have the fuel line regulated before it ever reaches the fuel pump mounted on the block" __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 327 Cu.In./THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

04-28-2008, 02:19 PM	#7
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 387	Thanks, I do have the plate that covers the engine blocks fuel pump. I'm also wondering if the pressure being so high right now is causing the engine to diesel. __________________ There Is No Replacement For Displacement

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04-28-2008, 03:00 AM	#2
brad4eva Senior Member Join Date: Apr 2008 Location: Tennessee Posts: 449	You got to few pumps pushing 2 much pressure, Pull the relay on the one in tank, easy theres a relay center or w/e its calledcomes off with 3 lil screw black caps on the firmwall

04-28-2008, 07:51 AM	#4
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	yeah i would go with that idea. i am doing the same to my c10. i paid like 50 bucks for a decent fuel pressure regulate

04-28-2008, 01:10 PM	#6
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	im not utilizing that pump. if you already have a electric pump all you need to do is get that regulator and put that between you carb electric pump. you dont need the pump on the block. i overlooked this on my first post sorry. you want to mount the regulator about 1 to 1.5 feet away from the carb in a spot you can easy adjust it. sorry i didnt write it sooner but i just breezed through the original post

04-30-2008, 04:05 AM	#8
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	mor ethen likely it is spaying way to much gas and may soon hydrolock on you

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