Fuel pump doesn't shut off

[Utemachine]

As soon as I turn my key into the on position the fuel pump kicks on and won't shut off. Is this a problem, has anyone else had this issue? 2004 Switch I with the MP 350.

[jsz]

Might be the relay. I have a 2002 Merc and a few years ago my fuel pump would start running the second I turned on the battery and would only shut off when I turned the battery off. Replaced the relay (looks like a 1" black cube)for about $15 and it's worked fine ever since

[Utemachine]

Might be the relay. I have a 2002 Merc and a few years ago my fuel pump would start running the second I turned on the battery and would only shut off when I turned the battery off. Replaced the relay (looks like a 1" black cube)for about $15 and it's worked fine ever since

Is the relay on the motor or somewhere under the dash?

[jsz]

top of the motor. might be mounted next to other fuses.

[Briancampbell34]

My 2002 21i will do the same thing occasionally. Just tap the relays that are on the port, top rear side of the engine. A sharp tap with your finger or screwdriver handle should do the trick.

[chpthril]

My 2002 21i will do the same thing occasionally. Just tap the relays that are on the port, top rear side of the engine. A sharp tap with your finger or screwdriver handle should do the trick.

You're probably about due for a pump failure. Sounds like the pump is drawing a higher current, which is normal with age and wear. The higher current = more heat across the relay contacts. This will kinda weld them together.