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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Fuel Tank Lock Ring Leaking

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Old Jan 28, 2019 | 05:19 PM
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Fuel Tank Lock Ring Leaking

Has anyone had trouble getting the lock ring to stay in place on the sending unit on top of the front tank. This one is leaking after replacing the pump. Any tips for trying to tighten it up on the truck besides tapping a long screwdriver with a hammer? It kinda shifts to one side doing that and I need to be able to turn it and keep it centered better.

 
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Old Jan 28, 2019 | 06:17 PM
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That lock ring looks wrong, is that original? I can tell the pump is aftermarket as it lacks the proper indentation for the ring.
 
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Old Jan 28, 2019 | 06:21 PM
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Originally Posted by ford390gashog
That lock ring looks wrong, is that original? I can tell the pump is aftermarket as it lacks the proper indentation for the ring.
It is a Spectra pump. The lock ring is from the Dorman 55812 Ford/GM kit. The lock ring that came with the pump was flimsy junk. The original lock ring was deformed. I had it pretty snug but it must have vibrated loose.
 
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Old Jan 28, 2019 | 07:10 PM
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I can't tell from the pic but the locking ring should lock against tabs on the tank once it is rotated far enough.. thus making the possibility of it loosening impossible.
 
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Old Jan 28, 2019 | 07:28 PM
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Looks like you still could knock the ring another 3/8" or so towards lock. Do you feel the square cut o ring sealing?
 
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Old Jan 28, 2019 | 07:32 PM
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As it was mentioned, you still have lots to go to lock the tank ring. It needs to be snug and tight against the tank tabs. I have even tapped the tank tabs down after securing the lock ring to ensure that it's tight.
 
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Old Jan 28, 2019 | 10:01 PM
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It was farther around and doesn't seem to stay in place. I can't get it to rotate any farther from under the truck tapping on a screwdriver. Should have thought about tapping the tabs down. I've worked on these a few times over the years and never had one not stay secured.
 
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Old Jan 29, 2019 | 12:36 AM
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Well, It was a bit of a trick with the tank in the truck, but I was able to get the lock ring rotated into the locked position. I'm almost positive that's where it was before. We did have the tank down a couple times to replace the pump and then deal with a wonky sending unit. Maybe the last time I didn't get it completely back in place. Hoping it stays.
 
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