94 502mag efi problem......help

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06-09-2006, 07:44 AM

#21

Ted G

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Re: 94 502mag efi problem......help

There are no cold start valves. Where were you getting the fuel pressure readings from? Because the injector pressure is supposed to be around 30-40 and the boost pump pressure should be 5 or so. If your readings are that low you may have boost pump going bad.

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06-09-2006, 08:44 PM

#22

GOODT

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Re: 94 502mag efi problem......help

as jamie said, check the vst they are know to be trouble some at times

there is a fuel pump with sock in there along with a needle and seat It sounds like the sock is dirty

06-10-2006, 06:26 AM

#23

Steve_H

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Re: 94 502mag efi problem......help

had similar problems with my 93 efi. turned out to be the high pressure pump. 500.00 part

06-11-2006, 10:24 AM

#24

mkramer

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Re: 94 502mag efi problem......help

Well............here's the update...

Took apart the VST yesterday and everything checked out ok...then decided to check the fuel lift pump and found a very worn down lift arm.....I'm hopein this is the problem. Goin to pick up a new pump today......I'll keep everyone posted...

A big thanks to all who has posted......

Mark

06-11-2006, 10:52 PM

#25

inbetween

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Re: 94 502mag efi problem......help

Any updates?

06-12-2006, 07:20 AM

#26

mkramer

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Re: 94 502mag efi problem......help

Put the good fuel pump on the bad engine yesterday and she ran fine.....6#'s of pressure...The new fuel pump should be in tomorrow if I can't find one today.

Hopefully this fixes is the stalling problem when it heats up, we'll know Tuesday or Wednesday........

Thanks to all for the suggestions.........