Paul Thompson Posted July 7, 2014 Share Posted July 7, 2014 Came across a shed of a Morgan +8 today by the roadside the fuel pump wasn't working and they had run out of petrol the owner was convinced there neded to be oil pressure for it to get power. Has any body come across this? Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted July 7, 2014 Share Posted July 7, 2014 It may be a mechanical fuel pump ... driven by the engine ? Maybe there is an OP sensor to kill fuel pump if OP fails ..... bit like our inertia switch kills fuel pump after an impact ? Link to comment Share on other sites More sharing options...
7TOM Posted July 7, 2014 Share Posted July 7, 2014 I remember on the old rover 3.5 SD1 if you lost oil pressure the oil pressure switch would drop the earth to the fuel pump relay so there maybe some truth if the wiring architecture is the same 😶🌫️ Link to comment Share on other sites More sharing options...
Paul Thompson Posted July 8, 2014 Author Share Posted July 8, 2014 So what do you do to sort it? Link to comment Share on other sites More sharing options...
ChrisC Posted July 8, 2014 Share Posted July 8, 2014 Power the fuel pump via a fly lead, or earth the fuel pump relay via a fly lead, until the fuel pressure is there enough to start the car. Link to comment Share on other sites More sharing options...
Molecular--Bob Posted July 8, 2014 Share Posted July 8, 2014 These pressure switches are usually set quite low, so they trigger on cranking, once it has fuel it may start, but may take a while to get fuel to the carbs. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted July 8, 2014 Member Share Posted July 8, 2014 1 Find out if it's true: web, manufacturer, Morgan club forum etc. 2 Test the signal coming from the oil pressure sensor. (NB fault could also be in downstream wiring.) 3 Fly lead, as above, to test the theory and other components. Jonathan Link to comment Share on other sites More sharing options...
Guest Posted July 10, 2014 Share Posted July 10, 2014 Having had a number of Plus 8 Morgans, I've never heard of that. On my cars, an electrical pump has all that has ever existed. No oil pressure required. Link to comment Share on other sites More sharing options...
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