Faulty Return fuel line check valve (Banjo) - Dodge Cummins Diesel Forum

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post #1 of 8 (permalink) Old 10-19-2012, 12:50 PM Thread Starter
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Faulty Return fuel line check valve (Banjo)

What problems would arise if the check valve leaks.
My problem is hard starting when parked on level to up grade. Have checked all lines for leaks.

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post #2 of 8 (permalink) Old 10-19-2012, 12:54 PM
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I thought that a leaky return system won't cause a hard start ????

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post #3 of 8 (permalink) Old 10-19-2012, 01:25 PM Thread Starter
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Then what is the purpose of the check valve
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post #4 of 8 (permalink) Old 10-19-2012, 01:26 PM
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To maintain a certain pressure in the IP

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post #5 of 8 (permalink) Old 10-19-2012, 01:30 PM
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Quote:
Originally Posted by ACDELCOcummins View Post
I thought that a leaky return system won't cause a hard start ????
It will.....although there are many theories out there that it wont


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post #6 of 8 (permalink) Old 10-19-2012, 01:35 PM
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Quote:
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It will.....although there are many theories out there that it wont
Seems that Mopar1973Man said too that a check valve RARELY RARELY RARELY have an issue. Could be a rare case but I'd double check elsewhere

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post #7 of 8 (permalink) Old 10-19-2012, 05:05 PM
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It is rare...

Overflow valve failures was a P7100 thing not VP44. As for the return line it can drain out to a certain degree because the end at the tank is not submerged in fuel so it can and will drain down. So like I said return line usually don't cause issues but supply line will. That line is submerged in fuel so it should hold prime.

As for overflow valve


Kind of hard to hold prime when the overflow valve has a pin hole for bleeding the system.

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post #8 of 8 (permalink) Old 10-19-2012, 08:19 PM
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If it loses prime on level and uphill. I assume it does not when parked downhill?????
Start good on downhill is very good indication of return line issues.
There is banjo bold on back of head and a three way fitting nearby that can leak air into the line and cause drainback and hard starting. Next is the oring on each of the crossover tubes can detoriate and allow a leak... The leak is so small that fuel molecue cannot be forced out but the weight of fuel and a negative pressue in fuel tank as cools down can allow air to be pulled into return system.
The VP44 cannot deliver fuel to injectors until a slight backpressure (if you follow) is present in return system.These are the facts, Jack.

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