I have a couple of 80s trucks, also have a couple of spare tanks (bought each hoping for a not-rotted-out sending unit but failed there) Every aftermarket one I've tried or my son has tried, has been grossly inaccurate. As in showing "E" when in fact there's still a 1/2 tank. But that's another story.
Right now I'm needing the vent valves for each one that don't have busted off nipples. I see them for newer full sized Dodge vans and For jeeps, and mid/late 90s cars like cirrus/stratus but nothing for 81-87 D/W truck.
Anyone here either have some thing laying around or know of something that will fit the hole and work?

Just to verify I know what you are asking about. You mean a metal nipple on the fuel sender itself...and it has rotted off as is common to everything near NE illinois? Do you have any friends with a metal lathe? A fuel years ago I needed to add a vent to a tank. My solution was to get a stainless steel bolt. Drill a hole through the middle with a lathe. Then I fed it though the tank with a string to pull it up to where I needed it and bolted it down with a crush washer as a gasket.

If you use fresh rubber hose it will bite hard into the threads when you put the clamp on it. Just make sure to use a bolt very close in size to the hose you are going to use.

There is absolutely no reason you can't do something similar and retain your original accurate senders.

I have that problem too
But no I'm talking about the white plastic approximate silver dollar size "plug" with a single 3/16 nipple on it for a vacuum line

For the sending unit I have both 20 gallon and 30 gallon tanks sitting here, all have rotted off nipples.
My son has bought aftermarket ones for no less than 4 different vehicles. Every single one goes to empty when they should really say 1/2 tank. There used to be businesses that offered rebuild services but from what I can see "they are no more*.

My idea there is to buy a couple of the new aftermarket ones (I like the stainless steel part of that idea just don't care for the "inaccurate " part). And attach my working sending unit to them in place of the inaccurate POS' that they all seem to come with

Maybe https://www.amazon.com/SamWinGear-Rollo ... r=1-9&th=1

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63 Plymouth Valiant Wagon

Have you taken any resistance readings of the "good" vs "bad" senders. I would be curious about how the "bad" senders are calibrated compared to good units.

That rollover valve is a neat item, is that an example of what part you need?

No, I haven't taken any readings. All I know is what I have seen my son go thru with 4 different aftermarket senders.
Every single one of them has read the same.
1- 1980 D150 step side
1-87 ramcharger
And 2 different 72 fury wagons.
On the fury he has now (he sold the first one back to the guy he got it from, originally #2 was bought as a parts car for #1 until he realized it didn't make sense to cut up a better car to fix a more rusted one) but after watching him fight with both, I got lucky at a Mopar swap meet where a vendor had several NOS sending units out on his table, I googled one of those and luckily/surprisingly it was the exact one for a 72 fury wagons. He had 2 of them, I wish I would have bought them both. I actually had both in my hand. But my kid put the NOS one in his current car and wala, it worked exactly as expected. Way different than how the aftermarket one he had put in had acted.
He has an aftermarket one in his garage, I believe he had bought a 2nd one for the ramcharger to try and it read exactly the same. It hit empty on the gauge, when it really still had 1/2 tank.
I'm gonna end up ordering at least 1 for the 30 gallon tank as I want that one back in my current project maybe then I can do as you're asking
Next question on that becomes. When looking at eBay, van's, Amazon, etc there's so many people sell them under different names (I'm betting they all come off the same line) what's the difference between a $42 one and a $76 one?


Back to the vent valve I ordered a 2 pack of those from Amazon and they're a little bit too small at the grommet surface.
Everybody wants to show "package dimensions" not actual part dimensions, the size of the packaging does me absolutely no good. That one is supposed to equal one that dorman offers, they (dorman) offer at least 1 other that I may also have to buy to actually see if that one will fit