Phillip Posted June 20, 2004 Report Share Posted June 20, 2004 Lately my '96 STS has been taking a few extra cranks to get started. I checked the fuel pressure and I am getting close to 50 lbs, but it quickly drops to zero (in about 1 min). Am I correct in assuming that the only causes (aside from a leak), is a faulty injector or FPR? Link to comment Share on other sites More sharing options...
98Concours Posted June 20, 2004 Report Share Posted June 20, 2004 You're correct, aside from a leak, a faulty injector (open), or faulty FPR is most likely the problem. Jeff Jeff 98 Concours 90 Seville 04 Corvette Link to comment Share on other sites More sharing options...
Ranger Posted June 20, 2004 Report Share Posted June 20, 2004 A leaky FPR or injector should cause a rich condition and aid in cold starts. I think there is a check valve in the fuel pump that is suppossed to prevent leak down and keep the system pressurised for quick starts. Next time try turning the key on but don't crank for 2-3 seconds. That will allow the fuel pump to pressurize the system if it has leaked down and should start quicker if that is your problem. Link to comment Share on other sites More sharing options...
Phillip Posted June 21, 2004 Author Report Share Posted June 21, 2004 That make sense. Is there any risk to leaving this alone? Link to comment Share on other sites More sharing options...
Ranger Posted June 21, 2004 Report Share Posted June 21, 2004 If in fact my scenario is your problem, I can see no risk in leaving it alone. Have you tried the delayed crank to see if that helped? Link to comment Share on other sites More sharing options...
Phillip Posted June 22, 2004 Author Report Share Posted June 22, 2004 Yes it did. The car starts reliably, but the delay start approach does save a few cranks on the starter. I was recently standed by a "no start" due to the fuel pump. I had it checked at a shop because I couldn't get it to my own garage. The diagnosis was a bad connection to the fuel pump. I think I will jack the car up and take a look. I am waiting to burn some fuel off in case I have to lower the tank. Thanks for the help. Link to comment Share on other sites More sharing options...
Logan Posted June 22, 2004 Report Share Posted June 22, 2004 Could be the pump wire burning out. Typically this problem will happen pretty suddenly, and worsen rapidly. The wire(s) that can burn are inside the tank. Plan on changing the pump and the harness. The tank does have to be dropped on that model. Latter Cadillacs have a fuel access panel. The FPR often, often, often fails...and leaks. As for GM fuel systems. Service manuals will have you believe they can hold pressure all night. Never in the field have I seen one hold for more then 10 minutes or so....most will hold ok for 2-3-4 minutes....with a slow drop. 50 psi in 1 minute is a pretty fast drop and requires another look. Logan Diagnostic LLC www.airbagcrash.com www.logandieselusa.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
Phillip Posted June 23, 2004 Author Report Share Posted June 23, 2004 Thanks for the help guys. I will post my findings after I take the plunge and remove the tank. Link to comment Share on other sites More sharing options...
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