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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old February 8th, 2018, 09:24   #16
[486]
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Join Date: Mar 2014
Location: St.Paul, MN
TDI(s): 02 golf ALH
Fuel Economy: 42 stock, 47-49 now
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broken link
https://www.youtube.com/watch?v=4OKRRAkmX3M

looks like it
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Old February 8th, 2018, 14:34   #17
martin33100
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Quote:
Originally Posted by [486] View Post
That's the correct link for it after the filter, has about half the flow in comparison.
When I finnish my current shifts I will collect a new filter and retest the flow after the filter.
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Old February 12th, 2018, 14:55   #18
martin33100
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It may have been a faulty tandem pump leaking oil into the fuel return, cut the old filter open and it was full of oil.
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Old February 12th, 2018, 20:52   #19
[486]
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fuel in video does not look oil contaminated, one would think it would be in the return fuel to the tank if it were in the fuel rail, not knowing the details of the fuel loop.

maybe algae in tank?
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Old February 13th, 2018, 07:41   #20
martin33100
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Quote:
Originally Posted by [486] View Post
fuel in video does not look oil contaminated, one would think it would be in the return fuel to the tank if it were in the fuel rail, not knowing the details of the fuel loop.

maybe algae in tank?
It does look like oil and carbon in the filter, the fuel return from the cyl head runs back through the filter because it has an in built thermostat. This thermostat doesn't allow the fuel to return to tank when the fuels is cold in winter.
As it's been cold recently the fuel return would have been going back through the filter and back into the tandem pump hence the oil in the filter.
I had a spare tandem pump so swapped them yesterday.
I know a guy that owns a VW garage and he said it's actually quite common to get this problem with failing tandem pumps if the vehicle has a 4 connection fuel filter with built in thermostat.

Last edited by martin33100; February 13th, 2018 at 07:45.
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