fuel presure problems
07-08-2006, 06:22 PM
#1
0.0 BAR
Thread Starter
Join Date: Nov 2005
Posts: 15
fuel presure problems
my car starts and idles fine but when you rev it it leans out and the fuel presure goes down ...this is my fuel system i have a wallbro 255 fuel pump ,,paxton fuel prsure regulator with 1 to 1 boost ref vac port,,venom 720cc injectors -8 fuel line all around....for my understanding a boost ref regulator suppost to make the presure go up when vacum is aplied
07-08-2006, 07:52 PM
#5
1.0 BAR
Join Date: Sep 2005
Posts: 199
Re: fuel presure problems
Even though its a rising rate with boost it will still rise like a normal fpr as negative vacuum goes toward postive. Sounds like its working backwards for some reason. Perhaps you have it hooked up backwards?
07-08-2006, 08:19 PM
#10
1.5 BAR
Join Date: May 2005
Posts: 840
Re: fuel presure problems
Everything is hooked up correctly.
The problem we where having is when the fuel pump comes on (new walbro inline 255) with the engine off it goes up to the 42# that we want, but then after about 4-5 seconds the pressure drops down to 20 or less and then bonces around about 10#.
It does the same thing with the car running(well hardly running) with or without the vacume refrence line connected.
And while running if you tap the gas the pressure will go all the way down to almost 0.
As of now I am betting it is a bad pump. It is slightly lounder than my 255 inline and he did run the tank dry here recently, but it does have a large inline filter before the pump also.
Also everybody...Tell him not to give up on this car. He is so close to having a damn quick little street car. It's a built bottom end (eagle rods, wisecos) He has a nice cam, about the best head you can get, a good size turbo and a EFI that is pretty much ready to go.
I even have an extra inline 255 and regulator that he can barrow!!
Here is the car in question
Car starts and idles with megasquirt and EDIS with 750cc injectors :twisted:
It's just a few small glitches away from being done.
Idle video!!
http://www.eville140.com/3tstarlet/l.wmv
Later
Randy
The problem we where having is when the fuel pump comes on (new walbro inline 255) with the engine off it goes up to the 42# that we want, but then after about 4-5 seconds the pressure drops down to 20 or less and then bonces around about 10#.
It does the same thing with the car running(well hardly running) with or without the vacume refrence line connected.
And while running if you tap the gas the pressure will go all the way down to almost 0.
As of now I am betting it is a bad pump. It is slightly lounder than my 255 inline and he did run the tank dry here recently, but it does have a large inline filter before the pump also.
Also everybody...Tell him not to give up on this car. He is so close to having a damn quick little street car. It's a built bottom end (eagle rods, wisecos) He has a nice cam, about the best head you can get, a good size turbo and a EFI that is pretty much ready to go.
I even have an extra inline 255 and regulator that he can barrow!!
Here is the car in question
Car starts and idles with megasquirt and EDIS with 750cc injectors :twisted:
It's just a few small glitches away from being done.
Idle video!!
http://www.eville140.com/3tstarlet/l.wmv
Later
Randy
