Fuel Draning Back To Tank (1 Viewer)

[Wildbill]

I am having problems with watt I think is drain back but I don't know
I get the van to start after a lot of cranking it starts seems like the system is not staying pressured up
my thought are put none return valve NRV before the lift pump in the fuel line would this cure the problem as I think NRV in the lift pump has packed in
what do you think
bill

 

[jockaneezer]

I had something like that on an old Volvo that had a rubber priming button on top of the filter housing. The rubber had a small split in it that let air in and allowed the fuel to drain back to the tank.

 

[gus-lopez]

Have you got the fuel filter with the priming rubber button on as that is a known spot that eventually goes ?
An inline rubber bulb would stop run back.

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[jhorsf]

+ one for air leak on priming rubber check that first Bill

 

[greyman1]

not sure which engine you have, but if it is a mechanical pump one then a good place to look is the rubber leak off /return pipes that come off the injectors. they can be prone to swelling/splitting over time and therefore allowing air into the system . regards garry

 

[Gaston aires]

Non return valve inline is whats required.
Phil

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[Rooky Vanner]

Had the same problem on a mercedes common rail. Turned out to be the tiny rubber seal on the pipe connection to the pump had gone brittle with the heat? Of course I started at the other end looking for it!!!