fuel pump problems

[sblack13]

trying to fix my friends car, 1989 240SX SE 5spd w/ ka24e

at first i thought the problem was the pump. Tried using the walbro outta my 240 which worked fine. Worked for a bit, then now the walbro will only pump for about 1-2 seconds after the key is turned.

we tried swapping the relays by the battery still nothing,

and fuel pump just turns on and turns back off immediately. We hooked 2 wires from the fuel pump to the battery of the car and the fuel pump worked fine...So there must be a problem with the cable that the fuel pump connects to or theres another problem that wont let the fuel pump stay on...

oh and the fuse is fine, and when we swapped fuel pumps we swapped the whole assembly w/ the top cover and wire w/ the blue plug.

anyone have a similar problem?

[sblack13]

replaced the ecu with another 10 ecu still does'nt work. =(

[sblack13]

alright my friend just bought another car, guess we could't figure out the problem. Now the car is being parted out.