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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.
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.
2008 3500 stock QCLB dually Inferno red. Toys: Fuel injected Rampage, Road Grader, 1586 tractor, 60K genset, Honda ATV, and more. Back in business with a Hitachi EX270LC excavator. The dirt slinging has begun with 50+ acres to clear.
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