Outer Limits 4x4 Board

Hi guys,

My GQ TB42E is running on dual fuel and runs fine on gas but on petrol it runs horrible. It has no power until revs get high and will backfire often at low revs/feels like its not getting fuel i guess.

After any suggestions on what it might be and hopefully can fix it myself. So where do i start?

Thanks in advance.

Mine's doing the same. Clamp the fuel return hose from the pressure regulator and take it for a run. I did this and it ran well, now it's just a matter of whether it's injectors or regulator that's causing the problem. I'm currently trying to source a suitable bosch regulator as the OE Hitachi one's from Nissan are ridiculously overpriced.

ok I will give it a go tonight.

UPDATE: Found the pressure regulator. it has the vacuum hose and a fuel hose going into it. Clamp the fuel hose?

yep. Use multigrips or vice grips and cable tie them so they don't fall off and end up in your fan while your test driving it.

Ok that didn't work.

Can anyone recomend a mechanic in Seaford/Frankston area in Vic that could diagnose the problem with a fuel pressure test etc.?

remove your afm (air flow meter) from the housing, it is 2 x phillips head screws ontop of the air flow meter next to the air box, clean this with carby or electronics cleaner.

ive found this to be a problem on mine but i think mine is dead as the problem comes back, these can be damaged when your car back fires through the intake.

also if theres an airleak in your intake this will affect petrol more then gas and may not be noticable on gas but runs shithouse on petrol.

Mine was doing the same thing. It turned out to be the fuel pump. Runs great on petrol now. I noticed the fuel filter wasn't full of fuel (only about 1/4 full) so it was intermittedly getting petrol, causing it to backfire and run crap, it used to idle ok, but you had to pump the throttle to keep the revs up, let the clutch out and it would die.
Just another option to consider, although they aren't cheap about $190 I think.
Steve

vards wrote:Mine was doing the same thing. It turned out to be the fuel pump. Runs great on petrol now. I noticed the fuel filter wasn't full of fuel (only about 1/4 full) so it was intermittedly getting petrol, causing it to backfire and run crap, it used to idle ok, but you had to pump the throttle to keep the revs up, let the clutch out and it would die.
Just another option to consider, although they aren't cheap about $190 I think.
Steve

is yours carby or fuel injected?

It's a carby model

Took mine to PGS yesterday for fuel pressure test. Bloody fuel pump's shit itself. Rather annoying when i payed to have it replaced less than 2yrs ago

Ok. Spent all afternoon rooting around dropping out aux fuel tank and replaced pump with a 500kPa jobbie. What a prick of a job that is on your own with just one trolley and one bottle jack.

Runs heaps better now