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Old March 24th, 2016, 06:25 PM
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Ben Stauffer
87 110 pickup
Join Date: Feb 2016
Location: Lancaster, PA
Posts: 4
Fuel bleeding 2.5na

I just recently replaced two fuel lines that connect the fuel filter to the injector pump. After doing so I loosened the union bolt on top of the fuel filter in attempt to bleed the lines. The truck fired right up and will run all day and not stutter. But, after letting it sit overnight the truck has problems starting. It will start and run for a few seconds but then it quits and won't fire unless I pump the pedal. I don't think I bled the lines the right way. Tips?
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Old March 24th, 2016, 06:46 PM
rdavisinva's Avatar
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Robert Davis
Join Date: Oct 2004
Location: USA
Posts: 6,795
The sandwich style filter has the return line plumbed back into the filter via a banjo.
This recirculates air that cannot be easily bled off.
When the TDI engines came out this problem got corrected.
It is almost impossible to get all the air trapped out of the system.
I recommend installing a sedimenter close to the tank, then a 12V fuel pump that comes on when the ignition is switched on.
This will expose any leaks as any area that was previously leaking will drip fuel.
Next get rid of the sandwich filter and install a TDI style spin-on or replace the banjo bolt on the return line with a solid bolt so the return line fuel actually goes back to the tank and not back into the sandwich filter.
With the 12V pump, you'll have a self bleeding system and you'll never have issues bleeding your fuel system again.

PM if you need a source for sedimenters and filters.
They are relatively inexpensive.

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