Fuel pump fuse

[steve320ise]

H does anyone know where the fuel pump fuse is located and what size it is, I dont think it will be the problem but start at the basics, thanks

[jimbo1812]

Hi Steve

The fuse is a 20amp one, it will depend on the fuse layout that you have , but my one was in slot 15. Have you also looked at the two bosch fuel relay, they will either silver or brown.

[steve320ise]

Thanks,I have checked the fuse and its ok, Just tested through with a supply to the pump relay and I have 12v to the inertia switch , continuity through switch, will have to get under car on weds to check pump, bugger, Cheers Steve

[quattrophenia]

I'm not sure what your symptoms are, but if they are intermittent it could well be the fuel pump relay - 1 of the 2 small metal cubes in the passenger footwell attached to ECU, the other is identical in appearance and controls the immobiliser I believe). When it begins to fail they can get really hot and close the circuit (really scary because the whole car goes dead including power steering which is not great when powering down a busy motorway slip road at night!) My relay failed 4 times on my way home, it would work for a few minutes once it cooled down. If replacing them make sure you get the original bosch ones from a reputable dealer as the cheaper ones will drain your battery dead when parked up.

[Aussie John]

Sometimes the pump fuse is on the flying lead that carries the ecu and fuel pump relays.

[steve320ise]

Car has been stood for a while, put battery on it started ok and several times, then no fuel pump priming a d wont start, main relay is on and fuel pump relay pulls in for a few seconds. Looks like i have power to inertia
switch and switch is ok. Thanks

[spend]

Because the ecu switches the pump on/off 'at will' when testing you need to check resistance from the fuel pump relay output pin (or put +12v on it by jumping across the relay ~ but that can create its own risks of course ~ it can be the way to make the pump run continuously as an emergency measure if the relay / ecu fails).

Just hope its a bad connection at the fuel pump or faulty pump as the wiring down the door sill is one of the real nightmares (stuck in with expanding foam!).

Its also worth testing the ecu is switching the fuel pump relay with a test bulb across the relay pins (should light for a moment as you switch the ignition on ~ the prime ~ but then off until the engine runs) many have made false assumptions testing because the ecu is switching the circuit on/off momentarily as the ignition is switched.

[ButtonIt]

I had this the other day too... spade connector on fuel pump had come loose and fallen off, was also badly corroded so a quick clean, tighten the spade and it won't come off again in a hurry

[steve320ise]

Update , got under car and found spade earth connector loose put a new one on and away we go, well not away as I still have a bit to do to complete the rebuild but trying to get it ready for the MOT by end of the month, Thanks to all for your help

[ButtonIt]

I spent ages looking at the immobiliser and relays before I found that loose spade connector... simple things eh?

[spend]

ButtonIt said:

I spent ages looking at the immobiliser and relays before I found that loose spade connector... simple things eh?

You have to be very careful what you read on here

Plenty seem to want to force their 'solutions' onto yourany 'problem', its a religion not a science

[Andy JB]

Yep I had this once on a Bank Holiday Sunday in France !!!!!

Low car - grassy field = loose spade connector. When i changed the fuel pump I chose one with a screw fitting - never come loose since. They do sit too low for my liking compared to say a Cerb especially as my car is lowered slightly anyway on its springs its very near road surface.