Fuel Pump Staying On When Ignition Off

[jengis 0]

Background to the problem...

 

The other day I popped to the shop, five mins later, car wouldn't start. No fuel pressure so checked that the pump was priming- it wasn't making any sound so wiggled conector. Still nothing. Randomly, after scratching head getting frustrated it whirred into life... with the ignition off! Car started fine and saved me a long walk.

 

Today I took it out again, everything seemed fine. When I got back I started and stopped the engine a few times to try and re-create the problem. when I cut the ignition third time the fuel pump stayed on, and now I can't stop it without disconnecting the wiring.

 

Is this a problem with the pump or a faulty relay? tips to diagnose?

 

Cheers for any help

[James_R 3]

Tachy relay sticking. give it a bash

[marc t 0]

Could just be a sticky relay. I've also seen it with low battery or in some cases the alarm system seems to cause issues. Mine did this all the time till I disconnected the fuel pump from the alarm

[pug_ham 242 3 Cars]

If its a sticking relay a quick fix is to remove the fuel pump fuse in the glovebox, that should stop it.

 

Graham.

[BusEngineer 7]

I had a similar problem with mine staying on after id turned the ignition off, i took the tachy relay off removed its plastic casing, sprayed it with electrical contact cleaner and ive never had a problem since, that was 2.5 years ago

[jengis 0]

Thanks,

 

I gave the relay under the dash a few taps and it triggers it to switch, so pretty sure its faulty relay. I will try cleaning the contacts in the next day or so.

 

Hate electrical problems - central locking occasionally locks/unlacks when I shut the drivers door!

 

Cheers for helping