Fuel Pump problems

[rusty2]

Hi all, bought a scala as a non runner have replaced the pump relay, and no pump prime or fuel getting to the filter. Guy said it ran 2 years ago, will start with started spray. What is the best way to check the pumps to see which one could be the problem

[dozzum]

Remove the fuel pump relay and bridge the two big connections to make the main pump run.

The in tank one I have no idea about making it run other than a live wire straight to it. Its under the cover in the back seat.

[ianaudia4]

Obvious I know but be bloody careful running a live wire to the in tank pump, petrol+sparks=

Best to remove from the car and test on a bench.

[Brunty]

I'd be getting a multimeter out first. The power for the pumps also goes round the inlet manifold to all the idle control switches and valves. If one has failed it could be shorting the +ive out etc.

Of course, it could also be the fault of the ignition switch, fuse box....

[dozzum]

You wouldnt need to remove the cover on the tank to test the in tank pump so there will be no fuel vapour. But yeh a multimeter would be better.

[Village Idiots]

Check that the fuse is getting power. I suffered this problem due to water getting at the fusebox which resulted in the fuse not connecting on it's lower (feed) terminal, cleaning the terminal on the fuse produced a temporary result. You can test fuses for power with a bulb and wire (or a multimeter) as the terminals protrude slightly on the outside.

[rusty2]

Update have bridged the pumps and they seem to be running, however put 5 liters of fuel in the tank, and did not start, will plutter and run for 20 secs then nothing, have pulled of the main feed from the tank and is jut pumping air, next step today is pull out the lift pump and check the tank, is the external pump suppose to make a racket ?

[Brunty]

is the external pump suppose to make a racket ?

It will if it's only getting air, and then it'll burn out.

If the in tank lift pump is running, but not pumping fuel you'll need to remove it and check that it's submerged. Could be the rubber hose has become detached from the pump itself or blocked somehow.

[rusty2]

Wipped the lift pump out the pickup pipie looks fine but massive corrosion on the terminals and the return pipe is gone, tried to source unbraided fuel lines no one has them around me,,,, so try again tomorrow

[rusty2]

Both pumps runing however have good pressure on the lins, will start on the cold start valve but will not idle

[bensspares]

Have you checked the airflow sensor, ie, does it move freely or is it stuck

[rusty2]

Completly stripped and cleaned the air sensor was always movin freely , and all the injectors, still only running for a few secs then nothing, completly stumped

[rusty2]

Well this car is definatly Female, just went out after a few days and she's alive, perfect idle, main pump a bit noisy but purring like a kitten
Thanks for everyones input in resolving the problems.