Raggylad Posted July 24, 2007 Share Posted July 24, 2007 Having a seriously weird fuel (?) problem on my '83 110 V8. She starts & runs fine on LPG, but - when started on petrol started with difficulty, ran roughly for about 30 seconds then cut out - repeatedly. Pumping the accelerator prolonged this to about 45 seconds. That was yesterday - today she won't start at all on petrol. Possibly relevant facts/related symptoms ? - LPG is a simple single point induction system, injecting into the air intakes of the (Stromberg) carbs. Petrol system is standard as to pump & filter. - Petrol in tanks is only 2 weeks old. - New fuel filter fitted about 2 weeks ago, but had been running fine. - Fuel pump makes the right fast then slower ticking noises on startup. - Had been experiencing petrol vapourisation problems when running on the hot side in heavy traffic. - Had just fitted braided fuel hose from filter - fuel solenoid (part of LPG system) - carbs, to try to alleviate vaporisation problem. - Serious backfire when starting from (very) cold on LPG had blown front silencer box 4 weeks ago, so there is a new box (a pipe run to Y pipe) fitted. This sounds a bit rough on start up on LPG since the start of the petrol problem - with an intermittent burble/rattle from the area of the silencer box until the engine is warmed up. What I have done so far: - Reinstated the original fuel pipe; checked all fuel connections for petrol/air tightness. - Checked the top half of the carbs. Cleaned pistons & needles & checked diaphragms (OK). - Run the system in the emergency, petrol-only, override mode - no joy. - Disconnected the LPG solenoid to see if it was the LPG ECU playing up - no joy. Thoughts and/or advice urgently needed. Not a crisis - can still run on LPG - but we're meant to be going on holiday, towing the boat to an LPG-starved area (West Pembrokeshire) from next Monday ! Sorry for the rather long post - but if I had any hair left, I would be tearing it out ! Thanks. Nick Quote Link to comment Share on other sites More sharing options...
Coastcard Posted July 25, 2007 Share Posted July 25, 2007 Does sound like a fuel starvation issue to me. Have you disconnected the fuel lines at the carbs and turned ignition on to ensure that there is a good flow to the carbs (worth having an assistant with a container 'cos even though relatively low pressure, it should still come out at quite a rate!). Not sure about this 'ticking noise' you mention from the pump. Check all fuel lines for corrosion. Have you checked to make sure that you only have 1 fuel filter i.e someone hasn't installed a second plastic inline filter. Also, do Strombergs have a built in mesh filter (you would find this in the next suggestion). Next I would check the floats and chambers in the carbs and the jets for sticking/blockages. Hope this helps. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 25, 2007 Share Posted July 25, 2007 Not sure about this 'ticking noise' you mention from the pump. If it's a facet pump (many V8's were) then it ticks quite audibly, fast when there's no load/back pressure and then slows down when it has to work against something. They have a built-in filter, undo the end with a spanner and change the red filter bit, they are available from most car suppliers (Merlin, Think, Rallydesign, VWP, etc.): Quote Link to comment Share on other sites More sharing options...
Raggylad Posted July 25, 2007 Author Share Posted July 25, 2007 Thanks - good suggestions. I'll give them a try. Nick Quote Link to comment Share on other sites More sharing options...
Raggylad Posted July 26, 2007 Author Share Posted July 26, 2007 Problem identified (but not yet solved - waiting for parts); blocked fuel tap on the petrol solenoid of the LPG system. Quote Link to comment Share on other sites More sharing options...
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