Gas delivery woes after cleaning out gas tank

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cmjrgas
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Gas delivery woes after cleaning out gas tank

Post by cmjrgas » Tue Apr 30, 2019 10:27 am

Pulled gas tank, cleaned it out, cleaned out fuel and vent lines. If I prime the fuel line I can get it started and it will pull from the tank. Let it sit a couple hours it starts right up, runs for about 5 seconds and runs out of fuel. I can run an external gas tank just fine.

cmjrgas
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Re: Gas delivery woes after cleaning out gas tank

Post by cmjrgas » Tue Apr 30, 2019 10:53 am

To be honest the external tank was primed and obviously I couldn't drive it under a load. Fuel pump on it is the original and not rebuildable.

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Linda
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Re: Gas delivery woes after cleaning out gas tank

Post by Linda » Tue Apr 30, 2019 11:02 am

There is often a lot of gunk still around after a clean out. Mine was professionally cleaned and I still went thru numerous filters. I used VW filters until gunk was gone .
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Re: Gas delivery woes after cleaning out gas tank

Post by C.Costine » Tue Apr 30, 2019 11:49 am

To possibilities are: 1; sucking air at one of your connections. An old mechanic's trick is to take a little grease on your finger and smear a tiny bit on the mating surface of the flare fitting. This enables the two sides to slip past each other a bit to get to the position where they will best seal. 2; If you are still using a glass filter housing the cork gasket could be old and stiff so that air is sucked in at that point.
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Re: Gas delivery woes after cleaning out gas tank

Post by Mackn367 » Tue Apr 30, 2019 12:54 pm

I pulled my tank recently too and did the 3 step POR15 kit. I haven't re-installed it yet but I am curious - was this the same "cleaning" you did? Did you only clean tank or did you also clean lines?
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cmjrgas
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Re: Gas delivery woes after cleaning out gas tank

Post by cmjrgas » Tue Apr 30, 2019 2:08 pm

Major cleaning on the tank. There was about 1" of congealed black gunk in it. Took me three days to get it all out. Both fuel and vent inlets on tank were full of dried gunk. I had hard chunks I had to break up just to get them out, too big! Used combos of vinegar and water until it was all out. Even then let it soak over night in vinegar. Set it in sun for 24 hrs to dry, banged on it some more and got about a pound of rust scale. Set it back out and put in baking soda and water for about an hour and drained and let it dry. I ran lacquer thinner down both fuel and vent lines, blew out with compressed air.

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Re: Gas delivery woes after cleaning out gas tank

Post by Mackn367 » Tue Apr 30, 2019 3:07 pm

cmjrgas wrote:
Tue Apr 30, 2019 2:08 pm
Major cleaning on the tank...
Oh wow sounds pretty bad. How does your fuel filter look? It sounds like chunks may still be clogging your lines/filter/pump. Have you also tested the pump to make sure that’s not the cause? You can remove air filter and use pump and should see fuel spray. I still think it’s the line/filter getting clogged.

Do you by chance have a snake camera? I got one on Amazon for cheap and it really does help when trying to investigate internal issues.

Here are some pics I took with snake camera in my tank before I cleaned for reference...
E3CB07B2-89F1-4A2B-84EE-7542F90372DA.jpeg
F9603EC6-7A49-41DA-9F7D-33C4B098B711.jpeg
890752CC-4046-4151-945E-8298EF6700CE.jpeg
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