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Old 11-23-2015, 07:41 AM   #15
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The place I work has several sending units that may fit.
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Old 11-23-2015, 08:47 AM   #16
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Overlander, that looks very similar! Can you give us more info?
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Old 11-23-2015, 09:01 AM   #17
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Something to look out for on sending units. Just in the past week I've been researching what I need for my 74 Argosy. On my 74 the filler opening in the top of the tank is 3.00" in diameter. The sending unit with suction and fill lines has a diameter of 3.60" and is held in place by a locking ring.

What I have found is after 1975 GM made a larger opening in the tank and changed the sending unit to a larger diameter as well.

Looking at the picture Terry posted it sure looks like the sending unit has a diameter of roughly 3.00". If so I'm guessing that unit won't work in a post 1975 tank.

No one sells the correct sending unit for my 74 fuel tank but they do sell the 76 and later sending units. To make a long story short the 76 thru 79 fuel tanks and senders will work on the 74-76 coaches as a complete unit but I can't buy a later sending unit and use it on my earlier fuel tank.

With that in mind I'd suggest doing a lot of research before committing to buying any sending unit. Also from what I understand the Classics use a sending unit that is 0-90 ohms. Sometime in the early 90s GM changed to different type of sender.

Brad
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Old 11-23-2015, 01:07 PM   #18
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The one that Overlander posted looks just like the one I just pulled out of my tank.

Here is mine...





Like the pic Overland posted, mine is a "Tankcraft" unit, and states 90ohm.


Mine was working a while back, but I cant get a consistent Ohm reading on it... If its affordable I should replace it.
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Old 11-23-2015, 01:11 PM   #19
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Steve, what is the diameter of the round flange (the one with the pipes in it) on your sending unit? Sometime in the mid 70s GM made a change to the tank openings that required larger flanges on the sending units. From what I've been able to find out it seems like the diameter increased around 1/2" or so.

If the one Terry has is the same diameter then I'd say you have a match.
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Old 11-23-2015, 10:05 PM   #20
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Brad,
Tank sender flange looks like 2 5/8".
Hole in the tank is about 1 5/8".
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Old 11-24-2015, 05:41 AM   #21
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Whoa, that's not what I was expecting at all! But then looking closer at your pictures your's is held in place by screws. Most GM tank sending units I'm familiar with are held in place by locking rings.

You can pretty much disregard everything I've said previously about your sending unit as it appears to be wrong

What is the length of your sending unit? I'm looking for a 0-90 ohm sending unit for my auxiliary tank and one like Terry has might work.
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Old 11-24-2015, 07:58 AM   #22
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Just ran across this site, Tri Star Radiator for repairing fuel tank senders.

I might have them rebuild the original sending unit from my Argosy as I'd like to use it in my auxiliary tank.

Brad
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Old 11-24-2015, 08:00 AM   #23
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You're right. The one listed did not have fuel feeds nor did the one on my unit so it was a direct replacement.
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Old 11-24-2015, 08:23 AM   #24
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The beauty of the unit that I posted about earlier in this thread is that it attaches onto the original pickup pipe assembly. This allows you to get a new sender without the complication / expense of replacing the totally functional pipe and flange parts. Mine seemed to be well made with stainless steel and in good condition.
With this team hunting for the correct part, it will turn up if it is to be found.
But just realize there is a good work around available.

Cheers Richard
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Old 11-24-2015, 09:44 AM   #25
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Quote:
Originally Posted by tevake View Post
The beauty of the unit that I posted about earlier in this thread is that it attaches onto the original pickup pipe assembly. This allows you to get a new sender without the complication / expense of replacing the totally functional pipe and flange parts. Mine seemed to be well made with stainless steel and in good condition.
With this team hunting for the correct part, it will turn up if it is to be found.
But just realize there is a good work around available.

Cheers Richard
Richard, I was just getting ready to post a question about your sender configuration!

I did not realize the R8926 was usable with the original suction tube configuration. That might make things easier and cheaper. There didn't appear to be anything wrong with my original sender other than the resistor was no good.

There is a definite price difference between the OE style sender ($112) vs the ISSPRO style sender ($45).

Thanks for posting that clarification!

Brad
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Old 11-24-2015, 10:08 AM   #26
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Surly Brad, I could see by the ongoing conversation that posting the sender unit allready mounted to my old pickup pipes left some lack of clarity.
While trying to get this issue solved my first thought was to replace the Tankcraft sender, but I could not find a direct replacement available.
This Isspro mountable sender unit can be fitted to most types of pickup pipes and is working well on my coach so far.

Cheers Richard
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Old 11-24-2015, 10:24 AM   #27
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Just talked to Tri Star Radiator on the phone. Quoted price was $90 to $175 depending on how bad the original is.

The low end price is less than Step Van Parts wants for a replacement sender and the high end is definitely higher than other options that I have found.

At least we have several options for ensuring that we have a working gas tank sender.
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Old 11-24-2015, 10:24 AM   #28
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Brad,
From the underside of the flange the main pickup tube is 13 1/2" and the genset feed is 11 1/2". The return as shown in my picks is just a stub.

I could not get a consistent reading on my sender, so I took the whole assembly apart last night and cleaned the ground part, because there was some crud there.. working better now I think... I will pull it apart and post pics later today.
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