kpiazzisi
Well-known member
It's in the VW manual, but no one that I have asked so far has been able to substainiate weather or not a failed tandem pump will cause oil and fuel to mix.
I have several post on here, and I am sad to say I have had a lot of problems with my TDI. Most of the problems were my fault. I know my tandem pump has failed. I have been dealing with it, and so far have not ponyied up the 400 bucks for a new pump.
I have been having a seperate issue, which is intermitient white smoke. I tried almost everything to resolve the white smoke issue and have several posts on here asking for help troubleshooting the smoke issue.
One thing I noticed is that an oil change seems to resolve the smoke issue. Yesturday when I drained the oil, I have over 5 quarts in the drain pan. I believe I only put in 4 quarts when I changed the oil a couple of months ago.
In my opinion, I belive fuel is mixing with the oil just like it states in the VW manual. IF YOUR TANDEM PUMP IS BROKEN, I WOULD NOT SIMPLY BUY AN EXTERNAL CHECK VALVE. I WOULD REPLACE THE PUMP.
"The tandem pump must be checked for internal leaks between fuel side and oil side after reinstalling a used tandem pump, for example after renewing or repairing a cylinder head and/or when installing a “short” engine. When leaking it is possible for the fuel to mix with the oil, which may cause the engine to fail. "
I have several post on here, and I am sad to say I have had a lot of problems with my TDI. Most of the problems were my fault. I know my tandem pump has failed. I have been dealing with it, and so far have not ponyied up the 400 bucks for a new pump.
I have been having a seperate issue, which is intermitient white smoke. I tried almost everything to resolve the white smoke issue and have several posts on here asking for help troubleshooting the smoke issue.
One thing I noticed is that an oil change seems to resolve the smoke issue. Yesturday when I drained the oil, I have over 5 quarts in the drain pan. I believe I only put in 4 quarts when I changed the oil a couple of months ago.
In my opinion, I belive fuel is mixing with the oil just like it states in the VW manual. IF YOUR TANDEM PUMP IS BROKEN, I WOULD NOT SIMPLY BUY AN EXTERNAL CHECK VALVE. I WOULD REPLACE THE PUMP.
"The tandem pump must be checked for internal leaks between fuel side and oil side after reinstalling a used tandem pump, for example after renewing or repairing a cylinder head and/or when installing a “short” engine. When leaking it is possible for the fuel to mix with the oil, which may cause the engine to fail. "
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