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Old May 21st, 2007, 07:07 PM   #1
muddywater
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Default 1990 ranger 4.0 0 psi fuel pressure

hey i have a 1990 ranger that recently me and cheapthrillsb2 swapped in a 4.0 out of a 91 ex and we had a problem with no fire. well the bug is back and now it will run off of ether without a problem. i replaced the relay and its not clicking when i turn the key. with the key on i have no check engine light. when i normally turn the key on i have a check engine light, anit lock, and battery light on before it starts. the truck was idling fine when i was leaving work today and then all of a sudden it just died. no studder, nothing just shut off. we narrowed it to fuel but my pump isn't turning on and im wondering if that went bad that fast without warning or if it was something to do with teh 5 gallons of 110 octane i ran with 15 gal of 89. im lost on what i should look for. i dont think the pump is getting power. but the relay has power to it. so any ideas would be greatly appreciated im completely stumpped.
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Old May 21st, 2007, 07:10 PM   #2
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jump your pump wires with a 12V source, good pump test
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Old May 21st, 2007, 10:16 PM   #3
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there should be a schrader valve on the fuel rail... you can check pressure there. IIRC it should have 40 psi.
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Old May 22nd, 2007, 07:36 PM   #4
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i have nothing coming out of the rail at all no preasure. the pump is good but the pump isnt' getting enough voltage to run i assume. i tested it with key on and its got 7.5 volts.
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Old May 22nd, 2007, 10:42 PM   #5
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Quote:
Originally Posted by muddywater View Post
i have nothing coming out of the rail at all no preasure. the pump is good but the pump isnt' getting enough voltage to run i assume. i tested it with key on and its got 7.5 volts.
what is voltage across the battery?
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Old May 23rd, 2007, 06:09 PM   #6
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i have nothing coming out of the rail at all no preasure. the pump is good but the pump isnt' getting enough voltage to run i assume. i tested it with key on and its got 7.5 volts.
key on engine off the pump should get 12v for a few seconds (stops priming pump after PCM see's the engine isn't spinning). 7.5volts - if in fact you did test it at the fuel pump connector at the gas tank, is way under spec.

And X2 on the battery voltage - you should have 12.6 across the battery
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