Fuel pump?

[Cock Womble 7]

Right then. Got the new distributor cap and rotor arm, fitted them earlier at work.

Ignition on, press BRB, turns over. Doesn't fire. Good spark from the coil (as a colleague can attest to after he touched the HT lead!) but no brum brum.


After a while of trying, I just happened to notice that when I turned the ignition on I didn't get the familiar whirr from somewhere behind the seats.

I've always attributed this whirr to the fuel pump doing its thing - is that right?

If so, I guess no whirr means knackered fuel pump, right?

Thanks for any input.

[mickrick]

Check the fuse!
I once spent two days on my old Golf Cabrio trying to get it going. It turned out to be the fuel pump fuse!

[BertBert]

Or the inertia fuel cutoff switch?

[Cock Womble 7]

BertBert said:

Or the inertia fuel cutoff switch?

And where would I find that, if I had one?

[F355GTS]

Cock Womble 7 said:

And where would I find that, if I had one?

it's on the bulkhead in the engine bay, normally near the ECU and MFU, press the rubber button to reset or join the wires together to eliminate from your search

[Cock Womble 7]

F355GTS said:

Cock Womble 7 said:

And where would I find that, if I had one?

it's on the bulkhead in the engine bay, normally near the ECU and MFU, press the rubber button to reset or join the wires together to eliminate from your search

Ahhhh, so that's what that is.

Nope, I've tried pushing that.

[BertBert]

Have you tried bridging the connectors? Also you should (may) be able to measure volts there. If it's on the supply side to the fuel pump and has volts, you know there is a problem downstream with wiring, the pump or the earth. You'll be best off with a wiring diagram in support though. Dodgy earth for the pump could be a problem.

Have you run out of petrol?

Bert

[Cock Womble 7]

BertBert said:

Have you run out of petrol?

No, filled up on the way to work last Thursday and the gauge is still reading full (because it conked out and hasn't been anywhere since!)

[Incorrigible]

1. Test the fuel pump power supply, should be 12v. the yellow and green wire from the MFRU

2. If you have 12v there, check the power to the pump (multiplug behind the rear wing)

3. If you have 12v there it's probably the pump

4. If you have no power at 1. check the imobilisor

5. If you still have no power at 4. short the black and purple trigger wire on the MFRU, that should hot wire the fuel pump power supply

6. If you have no power at 5. either the MFRU is US or something even more sinister

[Cock Womble 7]

It's back.

Turns out that the resin "blob" that seals the wires going into the fuel pump had cracked, allowing the elements in and generally mucking up the connections.

All cleaned up and resealed.

I went the long way home

[Yellow 7]

That's good.
I took on a tank with pump connections just as you describe. Was fine after fixing it up.

Cock Womble 7 said:

It's back.

Turns out that the resin "blob" that seals the wires going into the fuel pump had cracked, allowing the elements in and generally mucking up the connections.

All cleaned up and resealed.

I went the long way home