redtransam95

iTrader: (7)

i have a newly rebuit 95 lt1 355 le2 cam and new walbro 255 kit from racetronix when i first fired it up it ran great for a few days now i get an occsonal stumble and recently the car doesnt always want to start up on the first try. hooked a fuel pressure gage up and i have 41-42psi at idle but when you hit the throddle at all the pressure drops to 38-40psi. going to change the fuel filter tomarrow as a startany other sugestions just kind of wierd this came about all of a sudden. any suggestions would help

Big Al

iTrader: (1)

Did you use the filter sock with the Wabro? Mine has two in the tank, one didn't have a sock and the inlet plugged up with something that looks like Styrofoam.

Al 95 Z28

redtransam95

iTrader: (7)

yes i used the sock that came with the kit

redtransam95

iTrader: (7)

ok changed the filter vacaum hooked up
key forward prime 38psi steady for at least 10min no bleed off
idle 42-43psi now a little improvement
under any throddle 40psi steady

now with vacaum unhooked
prime still 38 psi
idle 43-45 psi
under throddle 43psi steady

after car shut off holds 30psi steady no bleed off
does this mean my next step is regulator? or do these psis seem right?
also my gas gage after install is way off like showing at least a 1/4 tank above what it should.
what do i need to check next would like to get this straightened out

also is it safe to run around with vacaum unhooked from regulator to keep psi up in the 43 range instead of 40 for a while?

redtransam95

iTrader: (7)

ok noone can help me????

shix

gas gauges are always off because of tank design from my understanding. no idea about the rest of this stuff

redtransam95

iTrader: (7)

yeah but it used to be pretty close

FAD2BLK93

Is it possible that u may have bent the fuel level arm upon install or removal?

redtransam95

iTrader: (7)

well im pulling the pump assembly out this weekend and replcing the fpr early in the week we will see

redtransam95

iTrader: (7)

ok heres the latest car currently really hard to start needs throddle pushed to get it to even try at prime it goes to 45psi till pump shuts off if i pull the injector fuses motor fires right up till out of gas
leaky injector? any way to test this without pulling fuel rail as i have bosch 3 with those damn clip on thingys at the bottom that like to fall down the intake port if the oring pushs against it to much.

redtransam95

iTrader: (7)

ok car is leaking down 10-15 psi immediately after pump stops running hard to start doesnt hold right pressure as going down the road vacum unhooked only keeps pressure around 43 steady if i get car started its running rich and choking its self
leaking injectors???????

boostedlt1

iTrader: (2)

i'd pop the rail up and check to see if any are leaking

jaycenk

iTrader: (1)

Exactly. Pop the fuel rail up and prime it and see if any injectors are leaking. If not It's either the regulator or the fuel pump is not in right.

redtransam95

iTrader: (7)

ok ill try that tonight/tomarrow in my mind something leaking down most likely injector its running pig rich and chokes on its own fuel once i finily get it fired up using the throddle open1/2 to 3/4

redtransam95

iTrader: (7)

pressure leaks down after pump quits not leaking injectors checked today what should i be looking for? will be replacing regulator tomarrow its running pig rich to a point its hard to keep car running

redtransam95

iTrader: (7)

replaced fpr pressure issues the same still running rich still hard start help?????/

jaycenk

iTrader: (1)

Rich condition would not be caused by pressure bleed off. Only if the system was over pressure or leaking injectors or an internal leak in the regulator. Starting to sound like ignition or tune related. Who did the tune?

redtransam95

iTrader: (7)

moe from moehorsepower ran fine for a while when i first ran it now these problems poped up

Low N Slow

iTrader: (4)

If you are losing pressure and it's not an injector check the hose that runs from the pump to hard line coming out of the tank. I had the same symptoms and there was a pinhole leak in that hose. I found it by pressurizing the line with the pump out of the tank.

stevo9389

definitely check this. had the same problem when i changed out the 13 year old pump.