4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

96 4.6 looses fuel pressure after shut off

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Old Mar 6, 2022 | 07:44 PM
  #1  
Wayne67vert's Avatar
Wayne67vert
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Joined: Jan 2007
Posts: 122
From: FL
Default 96 4.6 looses fuel pressure after shut off

My 96 4.6 GT is hard to slow to start, it turns over just fine. It feels like it has lost fuel pressure after being shut down.
Anyone have an answer what I should look for to correct this issue?
Thanks in advance.
Wayne
Old Mar 8, 2022 | 08:24 PM
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Wayne67vert's Avatar
Wayne67vert
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1st Gear Member
 
Joined: Jan 2007
Posts: 122
From: FL
Default

Did some testing today. It seems like the fuel pump isn't holding pressure to the fuel rails after shutdown. I can turn the key on 3 or 4 times without hitting the starter, then turn and hit the starter and it will start quickly. This process primes the fuel system before starting.
The car runs good after starting without any starvation or hesitation.
The fuel pump was replaced last October before I bought the car. I'm sure it was a cheap fuel pump from Advanced Auto. I plan to replace the pump with a quality name brand pump and also replace the fuel filter under the car.
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