Astro 1985-2005
Chevy's first entry into the minivan class, offered in All Wheel Drive to add to its versatility.
Platform: M-Body

2000 Chevy astro 4.3 fuel pump issue

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Old Nov 16, 2017 | 4:31 PM
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Exclamation 2000 Chevy astro 4.3 fuel pump issue

Alternator seized up so I replaced it and belt. After which fuel pump didn't turn on so replaced it. Still doesn't start. Replaced fuel pump relay, no joy. Replaced ignition switch, no joy.

Here's the weird thing. I can jump the relay and pump runs. Forgot the exact relay number but I am get 2 12v readings on the relay...with relay out and multimeter testing. Getting 4 volts which I assume is sensor. This is all with key off. I thought I should only have 1 12v reading with key off but I'm getting 2. From what I read the prime will come on for 2 seconds and go off...looks like mine is staying on and draining my battery.

Haven't checked fuel pressure or spark on distributor.
Should I check that or do I have other issues?

Last edited by Matt9468; Nov 16, 2017 at 4:34 PM.
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Old Nov 16, 2017 | 5:31 PM
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From: kevinkpk
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Replace the relay for a start
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Old Nov 16, 2017 | 5:52 PM
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Originally Posted by kevinkpk
Replace the relay for a start
already replaced it. Nothing changed
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Old Nov 17, 2017 | 6:59 PM
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your forgetting something ! the pump runs by a relay and a fuse ! first check the fuse ! when you jump the pump your by-passing the pump fuse and relay ! check the fuse first and than the relay !
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Old Nov 17, 2017 | 8:48 PM
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Where's the fuse? I didn't see one labeled fuel pump but I checked every fuse under the hood and dash and none are blown.
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Old Nov 18, 2017 | 9:41 AM
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you should have 2 fuse boxes ! one by the dash and another one under the hood ! the one under the hood should have the pump fuse !
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