No Fuel Pump Noise at Start Up

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Mar 20, 2019 | 03:11 PM

#21 (permalink)

dinasrt

Senior Member

Joined: Apr 2010

Posts: 2,404

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From: Mendocino, CA

Re: No Fuel Pump Noise at Start Up

Quote:

Originally Posted by Staterules9

New pump came in while I was out of town but I haven't had a chance to get up under there and replace it yet. One additional bit of information is the old pump has a resistance from the positive terminal to the negative (with the power cables disconnected) of 3.0 ohms while the new pump has a resistance of 9 ohms. Based on this I'm guessing something shorted out. So now the current is flowing through the short and the voltage isn't making it to the electric motor in the pump.

My O.E.M. Pierburg pump(#A 000 478 00 01) w/ only 15k+ miles on it reads approx. 16 ohms resistance. It is fully functional/operational. I upgraded a while back to a regulated fuel system so it was easy to pull the O.E.M. pump out of the drawer and test. Edit: Checked resistance again this morning since it was just sitting there in front of me. Now it measures 38 ohms. Few minutes later reads 16 again. Normal??

Last edited by dinasrt; Mar 22, 2019 at 12:59 AM.