Fuel pump whines at ON & doesn't shut off, circuit opening relay AFM harness

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Nov 3, 2018 | 09:24 AM

#21

Co_94_PU

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From: Colorado

Quote:

Originally Posted by bensyota

What were the results of this? My pump also whines in the ON position. I thought this was normal. What does this mean if not?

If you look closely at picture number 15, you'll find there is a solder blob between the second and third lines, these are not supposed to be connected.

If you look back abit further you'll see that someone had swaped E1 and FC in the harness plug.

These two issues resulted in the pump being energized any time the key was placed to run.

.. There is no magic wand that replaces testing, TEST do not guess!

Nov 3, 2018 | 10:26 AM

#22

ocyota

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It was the AFM. I replaced it with another. No whine from fuel pump, no fuel pump energized until crank

Nov 8, 2018 | 08:59 AM

#23

SENOR NOODLES

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Joined: Apr 2018

Posts: 97

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From: Fair Oaks, CA

Quote:

Originally Posted by bensyota

What were the results of this? My pump also whines in the ON position. I thought this was normal. What does this mean if not?

sometimes it simply means the afm thinks air is coming through. Sometimes from people play with the afm, Usually from people popping the cover off and not resealing it.