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#1
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'99 Explorer Fuel pressure problem
I've been doing some troubleshooting on my Explorer recently. It suffers
from the hard to start problem as many others do. Sure enough, I found that the fuel rail pressure bleeds to zero almost instantaneously after it's shut off. The other interesting thing is that the fuel pressure reads 64PSI at all times when running, with or without the vacuum line to the FPR hooked up. So, it sounds like my FPR is stuck closed (causing the pressure to go to 64PSI) AND the fuel pump is faulty allowing the pressure to bleed back into the tank through the supply line. Has anyone ran into this problem and it only be the FPR? It seems unlikely. It doesn't seem possible that the fault lies solely in the fuel pump. My next step is to: 1. Double check the fuel pressure with another gauge. 2. Double check the idle fuel pressure spec. The Haynes could be wrong. 3. Replace the FPR and see what happens. 4. Replace the fuel pump if (3) doesn't fix it. 5. If that doesn't work, give up. On a side note, the truck never really runs poorly from a drivability standpoint, just hard to start, and intermittently down on power. Hopefully there isn't some other issue. Any help is appreciated. |
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#2
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Hello: I'm working on the same vehicle with the same problem and have
replaced the fuel pump already. However that did not fix the problem. Fuel pressure still bleeds down causing hard start. While I was replacing the pump I noticed a valve looking thing directly above the fuel pump in the line. Looks like a return valve or something it has a hose that comes off of it back into the tank. Did you replace that also? and do you think that could be my problem? Nothing else is tied into the fuel line except that and the injectors. I suppose I could have an injector leaking down. Please let me know if you replaced that valve, what it may be or if you have any other thoughts on this. Thanks in advance. |
#3
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Hello: I'm working on the same vehicle with the same problem and have
replaced the fuel pump already. However that did not fix the problem. Fuel pressure still bleeds down causing hard start. While I was replacing the pump I noticed a valve looking thing directly above the fuel pump in the line. Looks like a return valve or something it has a hose that comes off of it back into the tank. Did you replace that also? and do you think that could be my problem? Nothing else is tied into the fuel line except that and the injectors. I suppose I could have an injector leaking down. Please let me know if you replaced that valve, what it may be or if you have any other thoughts on this. Thanks in advance. |
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