installed a turbo pump on eco diesel won't start

[williamtaygan]

Hey, I know it's crazy, but I had a pump that partially primed and idled, but did not go beyond idle until I manually filled the injection pump. I have no idea how that could happen. But after I filled it manually it ran for years.  Maybe it was a fluke, but it's something easy to check.

[Toby]

Not a fluke. Stuck vanes in the supply pump. The fluke was that they got enough of them unstuck to run.

[srgtlord]

I havnt filled up on diesel in over a year, when did they start putting Biodiesel in as a pump lubricant?

[trent77]

quick update. Last night I ran the car and checked ins, outs, etc... As I said earlier, it idles great. What I have found though is it is constantly drawing air bubbles into the pump from the filter. I picked up a new filter and will start there and then work my way through the hoses if need be... and lets stay civil, we are all car guys here... Thanks for the input.
Trent

[damac]

quick update. Last night I ran the car and checked ins, outs, etc... As I said earlier, it idles great. What I have found though is it is constantly drawing air bubbles into the pump from the filter. I picked up a new filter and will start there and then work my way through the hoses if need be... and lets stay civil, we are all car guys here... Thanks for the input.
Trent

You said earlier you ran it into a container with no bubbles and same problems right?  You didn't have the filter connected at that time did you?

Because that is your starting point with a pump with issues.  You have to rule out the restrictions with a clear out bolt, and watch the fuel flow.  The pump will move a good amount of fuel through the hose even when just cranking.

[trent77]

The OUT bolt is clear.. I have removed it and cleaned it.  I ran the car from a container, but through the filter. I believe this issue has to do with me swapping the fuel delivery valves and I am stopping here until I get some responses to emails I have sent out. Thanks for the help everyone.
Trent

[srgtlord]

Swapping delivery valves should do absolutely nothing...unless there was something wrong with the valves or you ended up getting some crud in there somehow

[damac]

The OUT bolt is clear.. I have removed it and cleaned it.  I ran the car from a container, but through the filter. I believe this issue has to do with me swapping the fuel delivery valves and I am stopping here until I get some responses to emails I have sent out. Thanks for the help everyone.
Trent

Ok so you didn't really start at square one if you used that same filter.  Good idea you are getting another you should always drive with a spare on hand.

For fun hook a hose up to the old filter and try and blow through it.  If you can't with normal breath its probably clogged.

Bad filters can trick you.  You can cold start and idle on a clogged filter.  But go and try and drive that same car and stab the pedal and it can die.

This just happened to me a few weeks ago.  All of a sudden, with only 6,000 miles on a bosch filter.  I think I may have had some other things going on though in that I found pine needles at inlet of filter even though I thought I had blown the lines out when swapping jetta tank in. 

[trent77]

So, update..
It's running and running quite well. I took the pump off and took it to a local injection shop. They set it up on the test bench and straightened it out. I'd love to give you the specifics, but I don't know what they are, but they fixed it!! The only issue I have now is when I shut it off somewhere it is drawing air back from the pump to the filter via the supply hose. I will get to the bottom of it. Thanks for the input, and I imagine it will be getting the Gile's treatment in a year, I just wanted to run the car for awhile and feel better about spending the cash!!

Trent

[vanbcguy]

Most common place for air to get in to the pump in the manner you describe is the pump shaft seal. I'm assuming you aren't seeing fuel leaking anywhere?

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[trent77]

you are correct, no leaking fuel. The guy that adjusted the pump said that if that seal leaked it would be leaking fuel out.

[vanbcguy]

The front shaft seal is under suction when the pump us running unlike the rest of the pump seals. If it leaks then it will tend to let air in to the pump rather than leaking fuel out (though they can do that too).

However you can also have a leak at the injector return lines which can siphon air back in to the pump. Usually though that won't show air at the inlet right away after shutting off the engine as the air would have too long a pathway to go to show up that quickly.

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