tank sending units?
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Elder User
Joined: Nov 2010
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From: lincoln, NE
tank sending units?
wheres a good place to get tank sending units for a 76 f150 with a 4.9L? i found them on rock auto for somethign like 50 bucks a piece, which seems like alot more than it should be, is this an average price or what? i need two of them.
any help is appreciated, thanks!
any help is appreciated, thanks!
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I wouldn't do it, personally. A sending unit is one of those things that's just as likely to be in the same shape on a junkyard truck, as the one you're replacing. I don't think it's worth the effort to pull two gas tanks (junk yard and yours) just to see.
If the rheostat on your existing sending unit is fine, but the float is punctured, the float itself can be replaced for much cheaper. I have seen the floats for sale in various catalogs. The float is the weak point, because the solder that joints the two sides degrades over time, and the float fills with gas. The rheostat can be tested with a multimeter. You can also replace the sock and O-ring separately too.
If the rheostat on your existing sending unit is fine, but the float is punctured, the float itself can be replaced for much cheaper. I have seen the floats for sale in various catalogs. The float is the weak point, because the solder that joints the two sides degrades over time, and the float fills with gas. The rheostat can be tested with a multimeter. You can also replace the sock and O-ring separately too.
Thread Starter
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Elder User
Joined: Nov 2010
Posts: 726
Likes: 0
From: lincoln, NE
see i dont have a 76 truck, ive got a 91, and i bought a 76 motor and im putting it in, doing a carb swap and going to mechanical fuel pump, so im going to have to pull the electric in tank pumps, is there any other option than to get new sending units? maybe rig something up? any ideas?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
It would have been useful to state that from the beginning 
That's interesting - not really sure. That's more of a 91 question than a 76 question. First off, it's highly unlikely that a '76 sending unit in a '91 tank is going to work out because of the sending unit arm travel, mounting location, hole size, etc. The other thing is that I don't think a '76 sending unit will interface to your '91 instrument cluster because the resistance direction should be different between the two generations of trucks (so I am told). The sending unit has more to do with the fuel gauge in the dash and the tank itself, rather than the particular motor that is being used. It sounds like you're wanting to keep the tank pretty much the same, except just not use the in-tank pump; and there won't really be much information on that here in the 73-79 forum because none of these trucks had electric pumps.
That's interesting - not really sure. That's more of a 91 question than a 76 question. First off, it's highly unlikely that a '76 sending unit in a '91 tank is going to work out because of the sending unit arm travel, mounting location, hole size, etc. The other thing is that I don't think a '76 sending unit will interface to your '91 instrument cluster because the resistance direction should be different between the two generations of trucks (so I am told). The sending unit has more to do with the fuel gauge in the dash and the tank itself, rather than the particular motor that is being used. It sounds like you're wanting to keep the tank pretty much the same, except just not use the in-tank pump; and there won't really be much information on that here in the 73-79 forum because none of these trucks had electric pumps.
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