Fuel pressure problem
08-01-2007, 06:51 PM
#1
11 Second Club
Thread Starter
Join Date: Aug 2004
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Fuel pressure problem Hello everyone i just installed a walbro 255 pump and when i first started in the fuel pressure was about 64 psi and then i drove it for a day or two and know my fuel pressure is 58 psi and when i am full throttle the fuel pressure drops to about 40 psi why is this is it my fuel pressure regulator crapping out i all so run nos so i want it to be safe any help would be great thanks
Last edited by BLACKSS02; 08-01-2007 at 08:44 PM.
08-01-2007, 09:28 PM
#2
TECH Fanatic
iTrader: (11)
Join Date: Dec 2004
Location: Dragging 408's
Posts: 1,790
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by BLACKSS02
Hello everyone i just installed a walbro 255 pump and when i first started in the fuel pressure was about 64 psi and then i drove it for a day or two and know my fuel pressure is 58 psi and when i am full throttle the fuel pressure drops to about 40 psi why is this is it my fuel pressure regulator crapping out i all so run nos so i want it to be safe any help would be great thanks
08-01-2007, 11:30 PM
#3
11 Second Club
Thread Starter
Join Date: Aug 2004
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
So now i was driveing the car tonight and i have to turn the car on and off like three times before i can start it i guess i have to prime the system before i can start it could this have something to do with the regulator it not holding pressure in the line someone please help
08-02-2007, 09:38 AM
#4
Teching In
Join Date: Aug 2006
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Is there a check valve in the outlet of a walbro pump? Factory regs do a good job of holding pressure but if there is no checkvalve in the pump the fuel will just run back down the feed line.
08-02-2007, 10:44 AM
#6
TECH Addict
iTrader: (6)
Join Date: Apr 2005
Location: Indiana
Posts: 2,488
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by BLACKSS02
So now i was driveing the car tonight and i have to turn the car on and off like three times before i can start it i guess i have to prime the system before i can start it could this have something to do with the regulator it not holding pressure in the line someone please help
If there is maybe run some injector cleaner through it? Check your fuel filter too, perhaps it is a regulator...02's are in the tank i believe? And if it was the check valve, you should drop pressure quickly when you shut it off, so check that...keep the fuel pressure gauge hooked up and see what it does when the car is turned off, if it drops quickly that little ball in the check valve is probably worn out.
08-03-2007, 12:20 AM
#7
11 Second Club
Thread Starter
Join Date: Aug 2004
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
hello everyone i think i fixed my car i pulled the fuel pump and change the regulator and found some realy good hose and change that to and it seems to work pretty good the car at idel is 65-66 psi and full throttle its 60-62 psi i went for a long drive and its all good. oh yeah the regulator i used was from a chevy truck like 2002 i got the part from a parts store it was a standard or blue streek part the part # is pr 217 i will keep you all posted on how it works.
Trending Topics
08-03-2007, 12:31 AM
#9
11 Second Club
Thread Starter
Join Date: Aug 2004
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
The hose that goes from the fuel pump to the out let on the canster. The hose i used was like the stock fuel hose its a flexable plasic hose that is good with fuel or slovents
08-04-2007, 09:36 AM
#12
Staging Lane
iTrader: (4)
Join Date: May 2007
Location: Maryland
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
Did you modify the canister that the pump sits in? There is a write up about cutting a window into it so there is a better supply of fuel to the pump pickup.
I noticed after I installed my Walbro that, when I have a full tank of gas my fuel pressure goes up around 70lbs, then slowly drops as the level in the tank deminishes. Stops around 58lbs at a 1/4 tank. Anybody else see this happen?
I noticed after I installed my Walbro that, when I have a full tank of gas my fuel pressure goes up around 70lbs, then slowly drops as the level in the tank deminishes. Stops around 58lbs at a 1/4 tank. Anybody else see this happen?