This is destroying me. Car wants to start but nothing.

[deXtrous]

Okay so yesterday I made a thread about changing my fuel pump, which I did. Then today I changed my battery because the car wouldn't turn over at all. Now it seems like the ignition and everything is working but nothing is being pumped through.

I have dual fuel and I have a gauge that shows me when I'm using petrol and when I'm using gas. It used to light up when then car was on (with petrol light on) but now it simply doesn't. This happened after I changed the fuel pump. I'll attatch a picture so you can see what I mean.

Does this have something to do with the fuel pump?

I am 99% sure I put everything back in the right place with the fuel pump, reconnected all the wiring and so on. If I have to take it out again I simply wont know what to do with it because it's connected properly :S

Any other ideas?

[88GreenVN]

did you put the pickup in correctly? I've not changed a pump before tho.

Not blown a fuse?

[2DIE]

If you have a friend with the same car try swapping over the ECU, cost me a lot of money and alot of people even mechanics telling me its the fuel pump. Finally I replaced the ECU and it ran fine.

The ECU didnt come up with any fault code, but they dont even have a code to tell you that there is a problem with the ECU its self.

[deXtrous]

All the fuses and relays are fine.

I know the car runs because when I picked it up we used some 'instant engine starter' spray to kick it over. The guy who claimed to be a mechanic said all it needed was a fuel pump (and a battery). The car started when we used the spray so I just dont understand why it wont start now. I just took the fuel pump out and as I thought it looks fine

FML!!!

[2DIE]

Exactly the same as when I bought my car, no battery and they said it has a fuel pump problem. Check the ECU.

[88GreenVN]

Do you hear the pump prime when you turn the ignition to ON?

[BT1-355]

If the gas gauge doesn't light up, i'll be checking the fuse for the gas side of it. They are 7.5 amps x2 and most likey the gas computor will be on the passger side near the kick panel (thats where i fit the gas computor when i install lpg).... And when you do get it flashing again, i'll be doing a direct gas start up (igintion on while holding the gas button, the gas light will stop flashing and stay on).......

[deXtrous]

Exactly the same as when I bought my car, no battery and they said it has a fuel pump problem. Check the ECU.

Was your car driveable when you bought it?

Do you hear the pump prime when you turn the ignition to ON?

I will see when I get the f***ing fuel pump back on which doesn't seem to want to go back on flush like it did yesterday. God damn I'm seriously getting angry.

If the gas gauge doesn't light up, i'll be checking the fuse for the gas side of it. They are 7.5 amps x2 and most likey the gas computor will be on the passger side near the kick panel (thats where i fit the gas computor when i install lpg).... And when you do get it flashing again, i'll be doing a direct gas start up (igintion on while holding the gas button, the gas light will stop flashing and stay on).......

Neither gas nor petrol light lights up, whilst it did before I installed the fuel pump. I'll check the rest of the fuses though.


thanks for trying to help all. This is excrutiatingly frustrating and I can't even take my car to a mechanic because I am broke.

[deXtrous]

Alright so I got the pump back on. I don't hear it prime but then again even if it was priming I wouldn't know what the f it sounds like.

[macka75]

if it was priming u would definately know it was by listening underneath, even though u dont know what to hear for u, it only primes for a sec or 2 when ignition is turned on.

[88GreenVN]

When you turn on the ignition it pumps fuel to pressurise the system. If you dont start the car it will pump it back to the tank and you may hear some bubbles and squirts too. So with everything turned off noise wise - turn the key to on and you should hear the pump for a few seconds as said above ^^. If your not getting this your pump is not connected as it should be or not getting power to run.

[strgas]

What lpg system has been installed ? it may have a fuel pump relay fitted which will turn off the pump when on gas ( bad idea and i never wire the fuel pump cut )

[deXtrous]

When you turn on the ignition it pumps fuel to pressurise the system. If you dont start the car it will pump it back to the tank and you may hear some bubbles and squirts too. So with everything turned off noise wise - turn the key to on and you should hear the pump for a few seconds as said above ^^. If your not getting this your pump is not connected as it should be or not getting power to run.

Okay so I had a listen underneath whilst the car was being started... No noise, nothing.

What lpg system has been installed ? it may have a fuel pump relay fitted which will turn off the pump when on gas ( bad idea and i never wire the fuel pump cut )

It's a newer system installed mid 2008. It starts on petrol then clicks to gas. The picture above is the control for it. What's odd is that it used to light up on Petrol when the car was 'on'. Now it does nothing.

Out of options.

[deXtrous]

Is there a reason why the fuel pump would not prime after just changing the thing?

[strgas]

The switch looks similar to one used by sprint gas systems maybe 295 297 module if so this will have a fuel pump relay which can be wired to the fuel pump relay driver wire from the ECM . could be a faulty wiring job . where was the car converted ?

[strgas]

Is there a reason why the fuel pump would not prime after just changing the thing?

faulty pump or connections blocked intake or outlet etc etc etc

[deXtrous]

It was installed by John Corney. Licence number 21603 on the 29/05/08. No company name on the plate, but it was done profesionally. Just checked the two fuel lines (if that's what you meant) which come from the pump. They were both clear.

[deXtrous]

Was there supposed to be a lot of fuel in the tank for the first run of the pump? I read with GM cars you need a good amount of petrol in the tank so the pump is submerged and cooled, or else it wont start and it will get hot and severely reduce its life???

Anyone know if the same rule applies for commodores?

[strgas]

run any fuel pump dry and it causes damage after a while . as long as the swirl pot is kept full of fuel the pump remains wet and cool , maintaining 1/4 of a tank is a good rule of thumb

[deXtrous]

So I filled it up a bit ($5 worth - all that could fit in the jerry). I tried to run it at night but still no success but did get some hope. Without all the daytime noise I did manage to hear the fuel pump priming. It was like a soft creaking noise. I think that was it anyway.

So now that the fuel pump is out of the question... I'm stuck again. I still think it may have something to do with that light on the gauge not coming on. Any idea what could be causing this?

[strgas]

if your gauge wont light up when key is first turned on then recheck your fuses and ground wires if it has the system im thinking of there should be three fuses in total for the gas system two for the module one is constant 12v the other will be ignition power source the third should be rear lockoff fuse , check for power each side of the first two fuse , double check that all the connections to the module are fitted correctly

[deXtrous]

Alright mate, cheers i'll check that out tomorrow. Do those fuses have an effect of the petrol start up also? I would have thought the petrol would have run through even without that gauge working which is why I'm so stumped.

[strgas]

depends how the system may be wired if it switches and relay for petrol operation or not and if the injector is working or not all without power to the switch

[deXtrous]

The switch looks similar to one used by sprint gas systems maybe 295 297 module if so this will have a fuel pump relay which can be wired to the fuel pump relay driver wire from the ECM . could be a faulty wiring job . where was the car converted ?

Yeah just found the gas ECM.. It's a Sprint Gas AEB 295. Checked encapsulated fuse coming from the ECM and it was fine .... Dunno where any other fuses are.

[deXtrous]

Alright got the LPG gauge/change over switch working again. The car still doesn't start though.

HMMMM!

Fuel pump is priming, battery is new, spark plugs are fine.....

What can be wrong?