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Posted on Jan 02, 2017
The fuel pressure check valve in the electric fuel pump has failed, you will have to replace the fuel pump, it is in the gas tank, also replace the filter at the same time or the warranty on the new pump will be voided.
Posted on Nov 04, 2008
Thats normal on high milage engines. They do that because the cam and main bearings are warn.
Try an oil treatment.
Posted on Dec 27, 2008
Do you have the fuel tester hooked the in the overgrown air valve on the fuel rail in the back of the engine? Or do you have the fuel line unhooked in the back and hooked to the pressure pump? You want the fuel pressure to be in that 60 lb range so if you are hooked into the pressure valve on the fuel rail allowing fuel to go through, then I am betting it is the fuel pressure regulator. To get to that, you have to take the throttle body off and take the plastic plenum that covers the injector packs. On the back of the mount where your six pack of injectors are sits the pressure regulator. If it is faulty then it is dumping fuel instead of holding the pressure like it should.
Get a Chilton or Clymer manual and it shows you in pretty good detail how to fix it. I've done it to my 98 S10 with the same engine.
If you unhooked the fuel line so you are losing pressure from the line back to the pump then I would say your pump is letting fuel back to the tank when it shuts off. My money is on the first possibility though.
Posted on Mar 28, 2009
One of two things can go wrong here. The fuel pressure is supposed to stay after you shut off the eng or key. The reason for this is so the eng does not have to keep cranking while the pump builds up pressure. The fuel pump has a check valve that will hold the pressure and the injectors will hold on the other end. If the injectors are leaking fuel when you shut the key off you should be able to look down the intake after removing the air cleaner and see if fuel sprays down into it after you have someone cycle the key for you. I believe you still have the throttle body injection so i would start there to see if fuel is leaking past the injector. If it is not then the pump has a bad check vale but this is just the tip of the ice berg. Neither of these conditions will cause it not to start. It will just crank longer before it does. in other words don't concentrate on this to fix the no start condition. Be sure you have a good battery. If battery voltage drops below 10 volts when you are cranking it, it will not start because the computer will not fire the injectors. It will still crank but just not start.
Posted on Jun 08, 2009
did you just buy this vehicle? 20 PSI hot at idle may be considered normal. I would verify the oil pressure specs with a repair manual for that vehicle. If it is out of spec then recheck with a manual Oil Pressure Guage. If it is still out of spec it could be worn bearings or a bad oil pump, having worked on these cars I recommend you let a Professional change the engine if it comes to that, and if you have little experience at such
Posted on Oct 15, 2009
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