The check valve is in the brass fitting that connects to your fuel line that goes to the filter.
When looking at ECM it is located at the top left. You do not have to remove the ECM.
Cummins N14 start problem
Discussion in 'Trucks [ Eighteen Wheelers ]' started by theguy1900, Nov 27, 2021.
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All great points, most drain back issues I've seen are fuel pump. That's why I would start with a line in a bucket. Work backwards. Those cooler plates will suck air.
Generic steps are making sure tanks vents are not plugged. Visually inspect fuel lines. Fabric braided lines fail around 7-8 years. The will suck air before they leak fuel.YardMule89, cke and clausland Thank this. -
I checked the tank vents, all good. Fuel pump was replaced half a year ago. Do you think it could be failing so soon?
YardMule89, jamespmack and cke Thank this. -
Cummins part or aftermarket?
Seriously, take a line from pump straight to a 5gal bucket and test. If problem goes away, your issue is before pump. If your problem still exists. Its pump or after. Simple diagnostics.YardMule89 Thanks this. -
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