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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old July 22nd, 2018, 13:27   #1
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Default Is this correct?

Fuel is pumped from the tank via the lift pump to the filter and then to the tandem pump, to the injectors. Unused fuel then goes back to tandem pump to be returned through fuel temp sensor to filter and then from filter to fuel cooler and then back to the tank. Yes? Thank you for your input.
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Old July 25th, 2018, 11:05   #2
Join Date: Jan 2001
Location: mi 48836
Fuel Economy: 53 max, 42 min, average 46

Once the fuel warms up to the required temp, the thermal tee on the filter routes the excess fuel to the tank. Prior to that, the fuel returns to the filter and the thermal tee circulates the fuel back to the tandem pump to aid the fuel in warming up and keeping the fuel filter from clogging from gelling fuel in cold weather.
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Old July 26th, 2018, 05:36   #3
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Thank you.
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