oe542eeb Posted December 27, 2020 Share Posted December 27, 2020 I lose prime overnight on my 285 em6. I suspect this check valve. Anyone know a check valve cross reference number that will work? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65383-1979-em6-fuel-pump-check-valve/ Share on other sites More sharing options...
mrsmackpaul Posted December 27, 2020 Share Posted December 27, 2020 Nope sorry, make sure you have no leaks in the return half of the system as this will cause it to loose prime over night So all the hoses between the injectors, the air start if fitted as well as the line to the tank Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65383-1979-em6-fuel-pump-check-valve/#findComment-466209 Share on other sites More sharing options...
Paul prinzo Posted January 5, 2021 Share Posted January 5, 2021 I found a check valve on line rated for fuel and I adapted it to work with my fuel line, it was about 50 bucks and I haven’t had any issues. The dealer wanted a couple of hundred bucks, crazy Quote Link to comment https://www.bigmacktrucks.com/topic/65383-1979-em6-fuel-pump-check-valve/#findComment-466572 Share on other sites More sharing options...
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