Question about 1990 Ford Mustang

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My Mustang 1990 2.3 will not start for long. The fuel pressure only goes up to about 25 psi and drops to zero as soon as the pump shuts off. The regulator has been replaced and I do hear the pump come on and shut off as normal. I think it is probably the check valve in the pump. Have you heard of this before?

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It was not the high pressure check valve in the pump, it was a small hole in the hose between the pump and tank fuel outlet tube. I replaced the hose and every thing is fine now...Thanks anyway..

Posted on Oct 04, 2009

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Is it throttle body injection of SEFI???Most injectors need a specified amount of PSI to work correctly.Check your #'s first.Another consideration is Volume of fuel being delivered to the injectors.

Posted on Oct 03, 2009

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The warm up valve ( WUR ) can also cause hard starts. It is on the side of the engine with two stainless braided hoses going to it. It can be rebiult by Larry at CIS FLOWTECH.

CIS FLOW TECH LLC19225 County Road 13
Fairhope
AL 36532-3687
Phone: (251) 929-0190
Category: Fuel Systems and Parts, Motor Vehicle


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If the fuel pump is original to the car & I would
doubt it,then that is the problem

Does the fuel pressure drop before it shuts off

I like to road test with the gauge taped to windshield
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You have to determine what your losing at the time it shuts off

I think you should have 55 to 60 # pressure

You could put that question into google for the answer

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