FUEL PUMP WONT SHUT UP
 

Could any one help. Went out yesterday and my bike cut out and now will not start. When turning on the ingnition the fuel pump runs continuously. I know it should prim and then shut off but it doesnt. I've took the pump off and checked the fuel filter and pipes for any blockages and none found. I've removed every snap connector I could find, cleaned them and given them a spay with WDf but still no joy. Is this a problem with the pump or something more serious like the ECU?

What bike mate ?


if it 916/996/or 748 it could be the chip in ecu.

I fitted a chip once and pump would run and would not stop and bike would not start!

Put another chip in all ok.

But you have to work out why it cut out and spiked the chip ?

did you pressure test the pipes ? :rolleye::bouncy:

Hi guys thanks for the gen. The bike is a 1995 748 SP. I did try the origional chip but the problem was still there. No I havnt pressure tested the pipes. How can I do this?

As a safety feature, the computer is designed to shut off the pump anytime it doesn't get a signal that the engine is running. Your problem could be something as simple as a poor connection to the RPM sensor. I'd first try disconnecting-connecting the harness connector to the computer to clean the connection pins, but it sounds like you've done that. Use electrical contact cleaner if necessary, but avoid using WD40, it leaves an oil residue.

The next step would be to swap the computer with one that you know is functioning.

[Edited on 8-13-2005 by Shazaam!]

Could be the fuel pump relay stuck on, the relay is one of the 2 large relays under the seat.

I had a very similair thing when i refitted my standard termis and original chip to my 748s. Fuel pump would not shut off. Replacing the chip fixed it. Does the bike turnover? Mine did and there as a real smell of petrol, seems at least one of the injectors was open, no pressure was built up before ingnition and hence the pump kept running. Probably not much help... Good luck.