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Thread: VW MK4 1.9 TDI. Air in fuelline inbound to IP and control valve outbound.

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    VW MK4 1.9 TDI. Air in fuelline inbound to IP and control valve outbound.

    Should i expect no air visible in fuel inbound to Injection Pump in an optimal condition? Outbound; should the control valve on the fuel filter remove air from the filter and send it to the tank with all other post combustion fuel/air?

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    Benevolent Dictator Uwe's Avatar
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    Since this doesn't seem related to VCDS in any way, moving to General VW/Audi Repair.

    Mk.4 doesn't tell us much. Is this a distributor pump type engine or a PD?

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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    NostraJackAss Jack@European_Parts's Avatar
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    VW MK4 1.9 TDI. Air in fuelline inbound to IP and control valve outbound.

    Should i expect no air visible in fuel inbound to Injection Pump in an optimal condition? Outbound; should the control valve on the fuel filter remove air from the filter and send it to the tank with all other post combustion fuel/air?
    Since this doesn't seem related to VCDS in any way, moving to General VW/Audi Repair.

    Mk.4 doesn't tell us much. Is this a distributor pump type engine or a PD?

    -Uwe-

    Whether a PD or a VE air should never be in the intake side of a hydro-static diesel or filter system during being bled engine OFF & Engine running "Pulses" observed in a sight glass hose, no?

    Don't PD engines have lift pump and would demonstrate a leak & VE do not?

    What if you had an inverse vacuum of pump leak & to permit air in on suction side of VE, that couldn't be good, no?

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    The vehicle is actually an 02 VW Golf 1.9 TDI. I think you will know what type of pump I have based on this information. I replaced the pump with a rebuilt one from Bosch because the original was leaking and i could not repair it. I do have VCDS and timing issues but i am currently try to isolate where the air is coming from between the filter and injection pump. With this condition I produce excessive bubbles at the nut of the injectors.

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