no fuel!!

[al 350i]

hi guys, having problems getting power to the fuel pump! got a 400se which i'm refurbing at the mo, i have had the engine running until the fuel pump packed up so i replaced the fuel pump but now i don't seem to have any power to it!! the fuse box is lying on the floor in footwell as are the relays but none of them are marked so don't know which one to check (although all fuses seem fine). the other things i thought it could be is the crank sensor or imboiliser, any ideas on where to start would be most appreciated.

[pwd95]

Is it a flapper or hotwire?

This was the position of the relay in my old flapper Wedge.....
Picture taken from the passenger seat in to the footwell.

Edited by pwd95 on Friday 22 January 19:31

Edited by pwd95 on Friday 22 January 19:32

[al 350i]

its a 1989 flapper. thanks for the photo should make things a little easier, mines was upside down on the floor, ecu is on the passenger seat and fuse holder is just dangling.

Edited by al 350i on Friday 22 January 20:47

[blaineuk]

it won't have power to the pump unless it is cranking.

[Wedg1e]

To further confuse matters, not all wedges have the same relay layout

[al 350i]

are there any markings on the relay to identify it? any clues on how to find out what fuse does what?

[honestjohntoo]

al 350i said:

having problems getting power to the fuel pump! ---- got a 400se --- had the engine running until the fuel pump packed up so i replaced the fuel pump but now i don't seem to have any power to it! any ideas on where to start?

Could be the pump was never faulty at the getgo and the problem was always the pump supply? No matter! Examine the pump supply system and test all components involved - AFM, steering module, main relay and fuel pump relay. In addition, local connections/wiring may be disconnected, damaged and/or corroded.

This clicky will take you though pump supply components, operation and testing. Your flapper Efi component layout is not the same as shown but your system is pretty much identical. A TVR bod might identify which bits are which. For more info on your flapper click on full Efi component list. If you need further reading material, follow the links.

[pwd95]

Ignition on, moove flap in AFM. Pump should burst in to action. If not, then you have a supply problem. Fuse, relay, wiring.....

[al 350i]

all sorted now, the contact on the relay was rusty.

thanks for your help guys

[jmorgan]

Following a suggestion I wired a lamp socket to the last point I could for the pump supply. If I think there is an issue I pop a lamp in and see if the feed is good. Gives a quick indication if there is an issue with the leccy.