crispinchurch Posted December 24, 2017 Report Share Posted December 24, 2017 2003 lpg 3.3 runs fine on petrol a bit low on power switches over to lpg ok at 3,000 rev+ will cut back to petrol beeping switch back to lpg will run fin untill pushed to between 3,000 + and will cut back againfilter on evaporator changed every 6000 any ideas please Quote Link to comment Share on other sites More sharing options...
0 Semmysonic Posted December 27, 2017 Report Share Posted December 27, 2017 I have had a similar problem but it happens quite rarely and only under hard acceleration at motorway speeds. I would guess it's a problem with the pump not supplying enough fuel so it switches back as a safety. Probably best to take it to an lpg specialist to have the system tested thoroughly Quote Link to comment Share on other sites More sharing options...
0 bignev Posted December 27, 2017 Report Share Posted December 27, 2017 (edited) Hi guys,i've not had this problem as yet, anything I can think of is only a guess, Is it when you are a little low on gas so not as much pressure, but they should work down to nearly empty because the stored pressure is way higher than the working delivery pressure, so if it was related it would be the pressure regulator from the tank to the front end, not allowing enough flow. (as there isn't a pump - it works on the pressure of the gas pushing it through, same as a house gas system principle) or the vacuum hose to the evaporator from the inlet manifold, leading it to mis read the suction pressure, but as semmysonic says, lpg tech guys should be able to read why it does it if they take it out rigged up to their kit. Edited December 27, 2017 by bignev Quote Link to comment Share on other sites More sharing options...
0 crispinchurch Posted January 12, 2018 Author Report Share Posted January 12, 2018 hiit happens anytime full or empty but more times when less than half tankthe pressure which over was set at .75 to change back to petrol i changed this as i saw on instruction .5this has improved it a lot i have tested the diafram many thanks for your help Quote Link to comment Share on other sites More sharing options...
0 bignev Posted January 13, 2018 Report Share Posted January 13, 2018 Ah good stuff mate. If the system is a few years old that diaphragm could be getting a little "stretched", it happens frequently on central heating boilers, a regular source of repair work for me on some models! Some have a hot water one, pump flow one, and the fan "air pressure switch" also has one. But good yours is improved!! Quote Link to comment Share on other sites More sharing options...
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crispinchurch
2003 lpg 3.3
runs fine on petrol a bit low on power
switches over to lpg ok
at 3,000 rev+ will cut back to petrol beeping switch back to lpg will run fin untill pushed to between 3,000 + and will cut back again
filter on evaporator changed every 6000
any ideas please
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