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Fuel system leaking down
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Topic: Fuel system leaking down (Read 1706 times)
October 23, 2016, 04:51:15 pm
coalminer16
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Fuel system leaking down
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October 23, 2016, 04:51:15 pm »
My 81 rabbit with AAZ transplant engine and a newer style fuel filter with a CAT filter (seen on tdi engines). I recently started to have an issue where the fuel seems to leak down and get air into the filter area. I have a hand primer bulb online before the filter and once I pump it things stay fine until it sits again for a couple days. If I run without repumping the hand bulb it barely runs and will die and not have power. Once I pump all is fine. Where do I start? No external leaks at all.
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Reply #1
October 23, 2016, 04:54:20 pm
coalminer16
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Re: Fuel system leaking down
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October 23, 2016, 04:54:20 pm »
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Reply #2
October 23, 2016, 05:19:24 pm
RunninWild
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Re: Fuel system leaking down
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October 23, 2016, 05:19:24 pm »
How is the gasket on the return line going into the filter? Can get some leaks there when they get old.
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Reply #3
October 23, 2016, 07:27:03 pm
coalminer16
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Re: Fuel system leaking down
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October 23, 2016, 07:27:03 pm »
I did just replace it but it looked good. I decided to change the the filter and orings.
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Reply #4
October 28, 2016, 11:58:52 pm
fatmobile
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Re: Fuel system leaking down
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October 28, 2016, 11:58:52 pm »
Clear line coming from the pump will let you know if air is leaking in around the small injector lines.
I see air at the filter output. Any air at the front of the pump?
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Tornado red, '91 Golf 4 door,
with a re-ringed, '84 quantum, turbo diesel, MD block
Reply #5
November 16, 2016, 12:02:49 pm
92EcoDiesel Jetta
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Re: Fuel system leaking down
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Reply #5 on:
November 16, 2016, 12:02:49 pm »
On the bottom of the banjo, I see 2 copper washers stacked against each other. That is not normal practice and could be where air is getting in.
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Reply #6
November 16, 2016, 01:01:30 pm
RunninWild
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Re: Fuel system leaking down
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Reply #6 on:
November 16, 2016, 01:01:30 pm »
I also just noticed the hose coming from the hand pump to the filter is a larger diameter then the filter nipple. That might be your issue? Maybe try running it without the hand pump and a proper diameter hose? or try replacing the hoses coming from the hard lines under the car to the filter?
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IDI Engine
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Fuel system leaking down