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Re: losing fuel pressure as soon as car is shut off
There is a check valve that holds fuel pressure, this valve is part of the fuel pump which located in the fuel tank, the fuel pressure regulator WILL NOT FIX THE PROBLEM. I am a Ford Factory trainned tech with 20 years work on all Ford cars and trucks from the 80's up.
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Sounds like your fuel pressure regulator. Check vacuum connection at fuel pressure regulator. That's the only easy check. the rest may have to be trial and error, i.e replacing fuel pressure regulator and then fuel pump if that doesn't work.
It sounds like possibly a fuel pump issue. The pump may be losing its prime because of a sticking check valve in the pump. Instal a pressure gauge and watch the fuel pressure after shutting the car off. The pressure should not completely drop off it should only drop a few pounds. If it loses more than a few pounds of pressure quickly then it may need a fuel pump. This can also be caused by leaking fuel injectors so further diagnosis is needed to find the source of the leak
Hi Rockandroll, Underground, or old timer? I think I would have the fuel filter replaced and have the fuel delivery of the pump checked. Once you've done that have the fuel rail pressure regulator checked too. Regards John
yes sir mostly its a fuel pump regulator problem . check the fuel pump pressure to make sure it is the pump regulator that controls the amount of pump pressure or change the whole pump would be better
have a good day sir
Hi and welcome to FixYa! The fuel pump relay regulates the power given to the fuel pump. If the fuel pump relay is faulty there will be no power to the fuel pump and will result to fuel supply failure. These relays just like the others serves as regulators so that the battery will not fail during electrical loads.
Hope this helps and thank you for using FixYa! Have a good one!
Replace the fuel pressure regulator in the intake plenum. This is the No. 1 problem for hard starting with the 4.3 L engine. It leaks fuel and loses fuel pressure when sitting for a few hours. You can try to cycle starter for a split second without cranking wait 3 seconds the turn key OFF then repete 3 times then tryto start. This will build up lossed fuel pressure and verify leaky fuel pressure regulator. Joe ASE Master Tech