derekbuckner1

iTrader: (2)

I recently put a racetronix pump in my car. Before, the stock pump was hit or miss. At times, it would work just fine but other times I would get no pressure at the rails. The problem got worse, so I changed the pump. With the new racetronix pump, I noticed it took longer to prime but didn't think much of it. The car has never failed to start. I wired in a fuel pressure gauge tonight and the fuel pressure goes to 60 when I key the car on, but falls to zero within just a few seconds. With the car running it holds at 60 with no problem

I'm trying to determine whether the new pump has a bad check valve or if it's my regulator. How can I locate my problem?

I may be completely wrong, but I had the mindset that a bad regulator would leak pressure slowly, but my pressure drops to zero in a matter of two-three seconds. Any advice would be great.

Thanks

never2low

iTrader: (50)

Not to hijack but, I would like to know as well. Ive been fighting this exact same problem for the last couple of weeks with my Lonnies dual setup with maybe 1500 miles tops on it.

man-o-war

Regulator is probably leaking back into the tank

haulass350

iTrader: (2)

i just had this same problem they sent me a walbro with the brass fitting on the top, mine doesnt need it, and it was spewing out fuel form that fitting and i was loosing pressure at WOT and it would take forever to prime up, pulled the pump back out and blocked the fitting and all is well now.

i had to get the g/f to switch the key on while i watched the pump prime before i could figure out what the problem was, make sure you have some good safety glasses lol

derekbuckner1

iTrader: (2)

Found the problem. The clamp where the flex tube connects to the top of the housing wasnt sealing up and was allowing fuel to leak out from there. put a new clamp on and it no longer leaks. Unfortunately I have one more question. Previously the fuel pressure would prime up to 60 and rapidly drop. Now it primes to roughly 49psi and holds. Still seeing 60 when running. Is this normal? Want to make sure before I hook everything back up. Thanks.

derekbuckner1

iTrader: (2)

Wish I had seen the safety glasses comment before testing everything -__- lol

derekbuckner1

iTrader: (2)

Seems closer to 45 on prime. 61 running. Is this normal?

poltergeist 02

iTrader: (65)

That is normal. Your ok as long as your not losing pressure at WOT.

derekbuckner1

iTrader: (2)

Thank you. I will check WOT this evening to be sure

poltergeist 02

iTrader: (65)

Let me correct what I am saying. Your pressure will drop a little but at WOT you should be getting 58-60psi