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air getting into fuel lines

hawkeyepoole

New member
51
2
0
Location
Keller, TX
After I replaced the pump, I pulled the line apart under the IP and turned in the pump. The amount of fuel that the new pump put out was quite impressive. I don't run straight emo by the way. I dilute it with enough Jet A or diesel for it to be very thin.

Even when the clear plastic line was collapsed no air bubbles were going thru it. I'm almost certain my problem is somewhere beyond that line under the steering gear. We'll see this coming weekend we hope.

Meanwhile I'm enjoying a beer in downtown Charlotte NC.
 

hoop

Member
617
14
18
Location
va
Good call Jim....I had forgot about that. That was one of the reasons that I disconnected mine.
 

doghead

4 Star General /Moderator
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Have you confirmed that your fuel tank is vented properly?
 

hawkeyepoole

New member
51
2
0
Location
Keller, TX
Well, I've fixed my Deuce I think. Since I got so many suggestions about fuel filters, I bought a new set. I replaced the in-tank pump and checked and reset the primary filter to no avail.

On Saturday I went to the hangar and pulled the secondary and final fuel filters. When I pulled the final filter, I discovered that the gasket was badly damaged. Now that I have replaced the gaskets and the filters, all is fine!

What's odd is that the truck ran fine for months after I replaced the fuel filters and gaskets. It seems that the heat cycling from our extreme heat has been causing the gasket to get 'looser'. Initially it sealed fine, but after numerous heat cycles it got worse and worse until it was leaking like a sieve. The odd thing is that there is obviously a low pressure, below ambient at those filters. I find that odd.

The truck is running fine now.

Here is an observation for those changing filters:

On my truck the secondary filter's gasket is very easy to properly install. The final filter's gasket, however is VERY difficult to properly install. It took me at least a half hour to get it properly seated and set into place. I even had to install and remove the filter can once before I got it right. Since this entire unit (the secondary and final filter holder) is CAST yours may be a different experience....

Attached you should be able to see a picture of the damaged final filter gasket.
 

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