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Thread Like Summary
Landy, Stevo666
Total Likes: 7
Original Post (Thread Starter)
by Landy
Landy
So, my 2018 M3W had its MoT today. 30 mile journey home no problems but as I pull in to the drive the revs start to drop and engine cuts out. It won't restart. It turns over fine but not firing up at all. Plenty of fuel in the tank. No previous engine issues. 3,900 miles Only.

So what is the sequence of checks? Is it the dreaded fuel pump?

Any help much appreciated! thumbs
Liked Replies
by Chris99
Chris99
Can you hear the fuel pump running when you switch the ignition on? If not check the cutout switch - a black rubber button to the right hand side of the back of the oil tank.
1 member likes this
by LightSpeed
LightSpeed
Get a new Walbro fuel pump.
1 member likes this
by Rog G
Rog G
All the symptoms of a bad fuel pump, if you have a fuel pressure gauge there is a schrader test port on top of the engine, it should be a steady 58psi.
1 member likes this
by RedThree
RedThree
Originally Posted by Rog G
All the symptoms of a bad fuel pump, if you have a fuel pressure gauge there is a schrader test port on top of the engine, it should be a steady 58psi.

+1 and I'll add that the 58psi needs to be with the engine running. With the ignition on but engine off, the pump runs for a few seconds and may appear to come up to pressure but with the engine running and a dodgy pump it can't maintain the pressure hence the cutting out.
Have been there, and have just bought another pump as a spare.
1 member likes this
by rcmatt
rcmatt
start with the pump
1 member likes this
by Taffmog
Taffmog
Hi Landy, does it start ok then stops as soon as the engine is under load? Then won't start? Leave it an hour and starts ok then repeats process?
That's a faulty crank sensor.............
1 member likes this
by Jon G4LJW
Jon G4LJW
Originally Posted by Stevo666
As posted earlier, I fitted a new pump and filter as per the group instructions and all running again.

Confused - you posted earlier that after fitting the new fuel pump it still wouldn't run???

Originally Posted by Landy
Two notes to self:

1. Ensure fuel lines are connected correctly to fuel filter!!
2. Do not allow bare leg to come in to contact with exhaust pipe!

She Lives again!
1 member likes this
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