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The quickest way i have found to check it is to hook up a pressure guage to the fuel rail and start the engine. During idle let pressure stabilize. Then breifly crimp or clamp off with pliers, the return fuel hose after the regulator. This is to confirm that the pump has excess pressure. Remember this is very briefly. If the pressure goes up then you are reading regulator pressure. If it doesnt go up then the pump pressure is less than the regulator pressure and may need to be replaced. Remember don't crimp the return line for more than a second or you run the risk of poping the rubber hose on the pump in the tank. It only takes a second to see if the pressure guage jumps up.

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โˆ™ 2015-07-16 18:16:09
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Q: How do you test the fuel pressure regulator on a 1989 Ford Econoline E350?
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