Hello everyone.
I have a TW with factory fitted Impco LPG, done 130K mostly on gas,runs fine on gas and no dash warning light. i have noticed it idling very jerky on petrol and diagnosed by usual mechanic as dirty injectors who quoted $100 for a no garuantee in vehicle flush or recommended $375 to fit reconditioned and tested injectors.
I have done a bit of Net research on how unburnt residue can get baked on especially after turnoff.My injectors have probably only squirted 15-20K, how much gunk could be on there that a flush or couple of tanks 98 RON wouldnt shift.
So I can understand how my system works does the petrol continue to be cycled from tank to fuel rail constantly while i am on LPG, and injectors only open when I switch over? Also my LPG manual says it starts vehicle on petrol and periodically switches back to petrol. i reckon it only starts on petrol for 1-2 seconds before i notice the fuel guage reverts back to LPG level.Can i do damage by trying to run injectors clean on 98 RON ? I am sure there is a good case for biting the bullet and paying the $375 but do I really need it. Thanks for any advice or anecdotes.

i dont know if much research has gone into

injector life using gas and unleaded as a mix

or what km

if the car is your only mode of daily transport
and you want to keep the car

fit the recon/newish injectors and
keep a record of how long they last

i am sure your valued input would be if intrest to the members

The issue, especially with those who run E10 is gunk in the tank and the fuel going stale. The injectors have a very fine spray mist when working correctly, add some varnish and sediment from the fuel line (as filter should filter what comes from the tank) and all of a sudden you have these issues. I see this so often on cars with Gas where the fuel can be very old due to non use, on a few extreme cases I have had to replace complete fuel systems including tank, lines, pump, injectors and rails. This is when I have even found rust in the lines and the tops of the injectors from the fuel line.

I would not bother with a $100 fix as first you need to find out the state of the tank inside

most of the issue will not be unburnt residue more bad fuel and any contamination which may be in the tank. E10 when used and left to sit absorbs moisture and can cause an absolute rust fest inside a tank

Also on a lot of the LPG systems the fuel pump is shut down when on LPG so you may find that this is the case with your car

Thanks .
Never used E10, always 91 and tried to use on petrol once a week when we remember,doubt fuel would be stale but maybe. I am running on 98 only now to burn out old fuel or gunk and giving LPG a rest until issue sorted. Will driving car while obviously jerking at idle and at start off do harm? I am watching temp gauge like a hawk! Should i remove filter and inspect for gunk?

any gunk etc .found .as you remove the old filter

check all the stuff madmagna mentioned (tank ..pump etc)

then fit a new fuel filter

Good advice
I have located filter OK, so pull fuse or relay of pump and crank to de pressure system then remove filter?, not so sure how to check inside tank though. Do you mean syphon out a fuel sample and inspect for debris. I assume pump is in tank, it sounds normal.
Thanks

There is no fuse as such, relay is a biatch to get to. IF you want to de pressurise the system lift the seat, take off the tank cover, unplug fuel pump and let car run until it stalls OR leave overnight and do before starting the next day as most pressure will bleed off

Also DONT forget to remove your fuel cap, any pressure in the tank will cause the fuel to gush out when you take off the old filter. You will need a 14mm pipe spanner as well, without this you will end up rounding the flange nut and causing yourself a whole lot of pain and expense

Ok will try on the weekend when I have time, but will the 98 RON clear any residual build up of gunk, is it worth persisting on this line? Thanks again

Nope, the only way to clean in injector is with speciality equipment. Bottle cleaner does nothing but absorb some moisture. 98 RON just burns a little better.

Also in situations like this where there is suspected fuel contamination then you need to do a lot more, start with the filter as you may have also been unlucky and picked up some dirty fuel

I am doing it on weekend when hopefully cooler, have bought a 14mm flare spanner and a new Ryco filter, had a look at the filter but cant get my head around the inlet side even with my glasses on!, it feels like a plastic clip around the hose , not a hose clamp. do I just lever it off over the rib. the filter came with a clip but says its for an AU falcon.
What are the tell tale signs of a dirty filter, sediment, rattle when you shake, dark colour fuel? Thanks for any advice

I had a similar problem with my wife's TF Magna. Had the injectors removed and professionally cleaned but the thing still starved of fuel under heavy load (when overtaking a large truck). I removed the fuel pump and filter from the petrol tank. The pre-filter on the pump was almost totally blocked solid with gunk which looked like solidified mud. It was a case of bash it and rinse it in petrol until it came 96% clean (I am sure that I would never get it 100%). Replaced the cartridge fuel filter as well (near left rear wheel) and it went like a rocket after that.

I always drain fuel filter into a clear plastic container. once it's empty tip remaining fuel onto white paper. You will see how much crap is in your fuel filter on the paper and sediment in plastic container.

Any clue to the fitting on the inlet side with the 90 degree bend? does it just pull off over the rib? I havent done it yet but want to know before i start. Thanks again.

I finally replaced filter this morning and all went OK. I just used a small blade screwdriver in tab hole to lever inlet side off. Car runs better on petrol now but not perfect, so what is my next move?
This filter is supposed to be only 2.5 years old changed by dealer at 105K service, is this amount of brown normal? the petrol running out of inlet hose from tank seemed normal colour. The thread of the bolt on filter holding ring seemed mighty hard & dirty if it was changed 2.5 years ago. I'm suspicious.
Bugger. I cant upload my image of cut in half filter, my posting permission says not post attachment. Does an administrator need to set this? help.
Tom

You need to use one of those image hosting websites and link to it here

Mate, a2.5 year old fuel filter is wayyyyyy too old.

OK Its got a new one now.14mm flare spanner a must. In my defence the owners handbook service schedule is every 105K or 6 years! Being mainly on LPG don't know how much it has worked. The element had gone a Tan/brown colour but no obvious sign of foreign matter and fuel dribbling out of tank hose looked clean, can I now discount rust as a factor? Car is running better on petrol but not back to normal yet, unless it settles down soon looks like injector clean coming up.