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fuel curcit issue

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Old Jul 14, 2012 | 12:58 PM
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acechase99's Avatar
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fuel curcit issue

the car is a 89 fourmula 5.7 TPI its has new fuel pump, filter, injectors, relay, plugs, wires, cap, rotor, MAF and ICM probable more but I think that covers the main parts. and the issue is that the car is not priming the fuel pump when first turn the key to on postion. I have used http://www.austinthirdgen.org/index.php?pid=35 to try and test all the wires and everything seems to work out fine. If i jump power to the fuel pump at the relay it starts right up as long as i turn the key right away becuase it doesnt hold the pressure (i think it drops down to at least 20psi maybe lower) I was thinking ecm but i used a test light and i get it to light up for the 2 seconds just still no pressure unless i jump it.
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Old Jul 14, 2012 | 07:43 PM
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Damon's Avatar
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From: Philly, PA
Re: fuel curcit issue

Where are you checking power with your test light?

Remember it takes a lot less voltage to light a test light than you might think. 5V will do it. But your fuel pump won't like trying to run on that much voltage. Might want to get your VOM out and read actual voltage on that same wire to get a reading of what's actually on the wire going to the fuel pump instead of just a yes/no indication.
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Old Jul 15, 2012 | 01:08 PM
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acechase99's Avatar
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Re: fuel curcit issue

o ill check it out more but last time it was reading 12 volts i think im just going to take it to the shop tomarrow
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