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You remove the hood, connect a fuel pressure gage onto the fuel rail, then drive it with visibility of the fuel pressure gage. If the pressure falls under 22 lbs., you need a fuel pump, and I'd advise you to get a Bosch on E-Bay. Normally they're $300+, but I got 2 on EBay for less than $100! Good Luck!

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Q: How do you test a fuel pump still in vehicle 0n a 1989 Isuzu trooper 2 4 cylinder?
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