Fuel Pump Not Priming

[4drftn]

hi,

the other night i pulled into the servo filled up like normal. go to take off and was hard to start. got it going and left the servo... got down the road, when applying acceleration fuel was being restricted and went to stall. eventually it did (around corner from the servo)

towed it home and realized the fuel pump wasnt priming i checked the fuse, was fine but replaced it anyway... so i took the fuel pump out, got the part no.GSS342 (walbro) and bought a direct replacement. put it in today and same result!

i also noticed that my ECU (microtech LT8) which controls my fuel and ignition was on the floor (fell out from under dash, which has happened before and not harmed anything), but i the checked plugs were in, and they were...

might i ad earlier that day (has happened before and on rare occasions) it was hard to start had to pump accelerator so it would pick the fuel up... thinking it could mean fuel pump was on the way out

what could be the problem?

cheers

Edited August 30, 2007 by 4drftn

[4drftn]

could it be the injectors? i have 550cc injectors intalled

[4drftn]

the fuel pump i took out works when hooked up to the battery, could it mean the wiring might be stuffed? but when i put the test light on the end of the plugs they have power going to them when ignition is on...

[tacker]

sounds like you need to direct wire you pump. Do a search and you will find reems of info on the subject

[QWK32]

how much power though? you need a multimeter to test how many volts are getting to the plug. i don't if the microtech works the same but other ecu's will send a signal to a relay to switch and give power to the pump, might be worth checking that. maybe relay is shagged and not giving a good connection when it switches.

[4drftn]

fixed the problem... my earth wire was getting no power what so ever... directed an earth wire directly to negative battery and works well.

responding to what QWK32 was saying - aparently the walbro fuel pumps need to run at 13.something volts to run at a full 100%. i may need to run a relay to get it at full working compacity but would it make my car run any different?