Be prepared when you remove the intake manifold that you may find more than a gasket issue. My '03 EB had the same leak, but I discovered the gasket is more of a formed O ring seal that sits in a channel molded into the plastic manifold. My manifold had cracked/broken so it no longer contained...
If you continue to have a problem you may want to consider installing an economical mechanical pressure gauge to monitor it. This will tell you If really have low pressure, for any reason, or whether you have an electrical problem. When I rebuilt my EB at 187K I screwed my pressure tester into...
This thread from 2021 may help some of you with the repair of the plastic vent leaks. The repair I described starting on page 2 is still holding up fine and there are still no leaks in the tank.
https://www.expeditionforum.com/threads/need-to-replace-my-fuel-tank.47332/
Thanks, Trainmaster. Yeah - while researching I've found several other posts with this same problem, and they seem to fail in different ways. Hope this process helps someone else.
SUCCESS! The welded areas all held pressure OK using the soap bubble detection method. I only tested at 2 psi because the vents both opened at about 1/2 psi. (I had a balloon on each vent to observe that they were working OK so I removed them & installed rubber caps) I figured 2 psi was 400% of...
The included photos show one of the vent failures and the plastic welded repairs mentioned earlier. They are rock solid HDPE which is the same material as the original vents. I will be pressure testing the tank over the weekend and will post results, but fully expect to have a permanent repair...
My 2nd gen '03 has the same type of vents that have cracked (both front and rear) and the front one actually leaks raw gas when the tank is more than 2/3 full while parked on a slope. I have removed the tank and found the manufacturer's name Eaton molded into them. After researching, I concluded...
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