Elec.Fuel pump running after shutoff

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Nov 1, 2002 | 02:47 PM

JoseyWales

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Junior Member

Joined: Oct 2002

Posts: 7

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Elec.Fuel pump running after shutoff

I have a 92 RS with the 6cyl. fuel injection
I just replaced the electric fuel pump. Is it normal for the pump to run about 15 secs after the car is shut off?
I don't remember this before. Thanks

Nov 1, 2002 | 10:02 PM

94-6spd

Supreme Member

Joined: Oct 1999

Posts: 1,112

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From: W. Kentucky

Car: 83 Z-28

Engine: 406

Transmission: TH350

Axle/Gears: 3.70

It sounds like a relay is stuck on or something. I don't know if your car has one but it might be worth checking out.

Nov 3, 2002 | 09:56 AM

Vader

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Joined: Jan 2000

Posts: 19,668

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Outlaw,

That's completely normal. The fuel pump is powered by both the fuel pump relay AND the auxilliary oil pressure switch. As long as there is residual oil pressure (above 4-7 PSIG), the pump will run. In colder temperatures, the oil pressure bleeds off more slowly, so the fuel pump will run on a little longer.

This diagram should make that clearer: