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I have to prime to start 1999ford explorer


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I suspect your fuel pump is going. Or your pressure regulator is letting pressure bleed off. If you have a pressure tester, you can attach to the shrader valve on the fuel rail n top of the engine. Pressure should be @ 40 psi.
Try this, turn key on and wait 2 seconds while listening closely at tank for fuel pump running.
Then turn key off and wait 15 seconds for power relay to click off. \Then repeat 2 more times with wait period.

Se if truck starts right up. If it does, then pressure is bleeding off.
The fuel pump (in the tank) has a chek valve in it to keep pressure from bleeding off too.

Posted on Mar 11, 2009


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