something I've never seen before and believe me I've replaced A LOT of fuel pumps. What I found on both units was quite amazing. What I resorted to trying was running direct 12 volt power to both units after I re-assembled them and took a five gallon bucket and submerged just the section of the module that holds the pump. So I have had this pump in and out this car now 4 times trying different things and yes all the voltages check out at the harness. The used unit I purchased has only 40,000 original miles on it. I have tried numerous different things from replacing the pump with a used assembly (by used assembly I mean the pump and module as a unit), to using the original module with a new aftermarket pump, to using the original pump with the different used module I purchased from the local salvage yard. I have been trying to address a fuel pressure problem with this 01 Sable. Can anyone confirm this possibility?įirst of all I am a certified mechanic and did work for a Ford dealership some years ago. If the pump is worn and the fuel leaks around them then the same condition could occur. If there is not a check valve then the gears of the pump would perform the same function. A waiting period may allow the fumes to dissapate and allow the pume to operate again.Ģ. If it is lkeaky, the heat of the engine could force the fuel out of the fuel manifold and possibly put fumes into the pump making it loose its prime. Is there a check valve in the system that prevents the fuel from draining back into the tank when the pump is off. Engine was off for one minute and would not restart. Later after the car sat for about a half an hour it started and ran fine. He tried cycling the fuel pump by turning the key on and off. Next he tested for fuel by depressing the valve stem at the end of the fuel manifold. The problem first occured four weeks ago. Is there anything else that could cause an intermittent fuel pump failure? It seems to me that if the fuel pump were bad, it would be more obvious and just stop running for good. Also, this does NOT happen only on very hot days, and the car has always had at least 1/2 tank of fuel when it occurred (these always seem to be suggested causes). I am hesitant to replace the fuel pump ($600 job!) unless I know for sure that this is the culprit and will solve the problem. I took it to a dealer and they were no help, since their diagnostic machine didn't see a fault code. I have subsequently replaced the fuel filter and fuel pump relay (in fuse box under hood) and it would seem the only thing left is the fuel pump itself. When I do hear the fuel pump run-up, the engine starts fine.
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I have determined that after the engine dies, the fuel pump is not running, as I cannot hear it run-up when the ignition is turned on. After letting the car sit for about 30 minutes or more, it will start and run normally. Then as I'm driving away, the engine dies and will crank but not start as if out of fuel.
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I'll stop to pick up my mail at the apartment complex, shutting off the car for about 1-2 minutes. The problem (so far) typically occurs after a short drive (approx 5 miles), and after the car has sat for at least a few hours (as when driving home from work or shopping). This situation has happened to me 4 times within the past 7 weeks, and seems to occur at random. I have a 2000 Taurus, 104K miles, 3.0 DOHC engine, auto trans.