Can I bypass it? What effect will it have on my car?

 

hmmm interesting... ttt

 

they use it from the factory to richen the car up after a hot start

mike

 

You can bypass it. I have, and have had no problems with it. It's purpose is to make the car run richer when the car is hot. It is an anti-vaporlock measure. I live in Florida, and haven't had any vaporlocking problems though.

 

I heard to bypass it you just run a line from the fuel pressure reg. to the lower nipple on the lim, true?

 

Yep

 

Do ANY of you have a fuel pressure gauge?
Something else the solenoid does......

When you are between 0-5psi of boost, Fuel pressure stays just below 40psi. Once you hit above 5psi of boost, fuel pressure jumps all the way up to about 50psi.

AND it also keeps fuel pressure at 50psi for a few minutes when hot starting the FD.

 

Flybye,

I think you are mixing up the fuel pressure solenoid with the fuel pressure relay. I believe the relay ups the pressure under load conditions by allowing a full 13.5 volts to the fuel pump.

The solenoid is only active during hot starting conditions (I believe as measured by the air temp and fuel temp sensort)

To answer the original poster... take it out, it's worthless I think. Mine has been gone for years. (And yes, I do have a fuel pressure gauge, and it still goes up under load).

Brian

 

Yep you're right. I forgot about the Fuel pump relay. I thought I once had someone tell me they disconnected the solenoid, and didn't get a high fuel pressure like they did before. Oh well

Anyways, just to confirm, I DID check right now the Service Highlights manual. The Solenoid only cuts vacuum to the FPR during a hot start.

 

i thot if you have the stock ECU u cant by pass it?? i just did the simplification setup from Rob Robbinettes' site and left the F/P solenoid in there as the person who wrote it (WADE??) says u should leave it in there!!!

 

I've removed solenoids and never had the check engine light come on. Other people have done the same. Then again to some people, their check engine light DOES turn on.

If you got the PFC, you ain't got nuttin to worry about.
Do a search for resitors in the 3rd gen section. If you are paranoid about the check engine light comming on, there IS a way to prevent it.

 

i wonder if they actually see 13.5 back at the pump?

mike

 

The issue you are referring to Mike is a valid one. I have seen cars (especially older ones) that get crummy voltage at the pump, so it's always a very good idea to make sure all your wiring is in good condition and any nearby grounding points are clean and making good contact. Even if the "missing" voltage is only a volt or two, that can make a real difference when you really need to pump a ton of fuel!