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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 22999
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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I have a 1995 isuzu pickup I replaced the in tank fuel pump

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I have a 1995 isuzu pickup I replaced the in tank fuel pump with a electric pump but now it won't idel

Hello and welcome to JustAnswer!


Did you install an inline pump and this problem happened immediately afterward? If that's the case then the inline pump may be creating too much pressure and it's overcoming the fuel pressure regulator, or it's possible that fuel pressure is too low.


The first thing you'll need to do is check fuel pressure. With the engine running and regulator hooked up you should see 35 PSI, with the regulator vacuum line unhooked it should be 42 PSI. If you see more than this then your new pump is pushing too much fuel, it will either need to be replaced with a suitable pump or another regulator installed to bring pressure down.


If pressure is low then either this pump isn't strong enough, it's power or ground feed is weak, or there is a restriction in the tank causing low fuel volume.

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