Fpr

I have the same problem I wish someone that had the same problem and fixed it would respond. Did the searches and all I found is the same as you, people having problem starting the car when hot. Hopefully the FPR is the culprit and not the pump. Help with this would be greatly appreciated:worship:


Proud Cadillac Owner

well, if you guys aren't using your eldorado's much...

how about selling them?
If the price is really good., I will buy them.

kevin

bobb said:

Got A 97 Eldorado. The Longer It Sits The Harder It Is To Start. In The Am It's Most Difficult. In The Tech Tips Section It Describes The Problem As The Opposite Not Starting When Hot. Could The Fuel Pressure Regulator Still Be Causing My Problem?

Click to expand...

I think you are on the right track. Electronic fuel injected cars should start quickly when properly maintained.

I would use the procedure to check the FPR (fuel pressure regulator first by searching the forum in the NorthStar 4.6L engine section.

There are several suggestions for checking (fuel pressure) at the fuel rail once it is started to ensure proper fuel pressure. A simple gauge adapter to an AC charge hose is all that is needed.

A leaking (bypass) fuel pressure regulator would cause cold start problems.

91TexasSeville Thanks for the suggestion, I am going to check it out, hopefully that is the problem, I checked for codes to see if it would tell me what was the problem but there wasn't any.

Kevinrea: I do not have an eldo mine is a Seville SLS, and I would not sell it! I love this Caddy it is just great. Thanks for the offer though.

Something to try for diagnosis...

When you get in the car turn the key to on but don't start it. Wait about 10 sec and try again. Do this several times. You should hear the fuel pump run but it will be fairly quiet. It will run a few seconds everytime you turn the key until it builds up pressure.

If it starts after trying this you need a new pump because it's letting the fuel drain back into the tank and empties the fuel line.

bobb,

the fpr regualtor is so easy to check, you should do it. It could be part of the problem.

HI ZONIE77, read your response to the hard starting when engine is hot, if fuel is draining back to the tank, then why is cold starting not a problem. and if the fuel pump is at fault how about a fuel pressure check valve added to the fuel line before the filter ,the check valve would let fuel enter the sys ,and not drain back to the tank.[ a one way check] just a thought, not sure if this would cause a problem with too much pressure build up and no way to return excess pressureback to the tank? this check valve sys is used on detroit diesels equipted with external gear meshed regulated fuel pumps . this check valve may by pass an important function of the tank mounted fuel pump.do you know if there isa check valve integral to the pump to hold fuel at the injectors .thanks brooklyn tony

The response was to hard starting on cold start. The FPR is usually the cause on hot starts.

The check valve is notorious for failing and letting the fuel drain back to the tank. The check valve is part of the fuel pump.