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Old 08-09-2010, 03:21 PM   #1 (permalink)
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1970 Fuel sending unit replacement

The fuel guage didn't work on my 70 impala so I decided to replace the sending unit in the fuel tank. The original unit is a canister design with two lines. One line is the supply and the other is the return. The only replacement I could find was a 1 line unit. The problem is what to do with the return line? Right now I have Tee'd it in to the vapor line close to the tank. The only thing I can think of is to remove the sending unit, drill a hole in top and install a fitting with tubing.
I don't remember seeing a fuel system design like this. In front of the engine is a metal filter looking thing which has 1 line coming in from the pump. 1 line goes to the carb filter housing and 1 small line goes back to the tank (return). It has a Quadrojet carb 4MV. What is the purpose of the return line? Any help guys? Thanks

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Old 08-10-2010, 10:43 AM   #2 (permalink)
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I would pull the sending unit back out and drill into either the tank or sending unit if there is enough room and install the new return fitting. I would prefer the tank so that the sending unit sensor is not damaged from the drill motor's vibration.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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Old 08-16-2010, 08:02 PM   #3 (permalink)
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to got off subject whats the deal with my 70 not deviating from half tank? even when empty or full? rust on the sending unit? remove and see?

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Old 08-16-2010, 08:10 PM   #4 (permalink)
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Quote:
Originally Posted by velvet muldoon View Post
to got off subject
1.whats the deal with my 70 not deviating from half tank? even when empty or full?
2. rust on the sending unit?
3. remove and see?
1. Don't know for sure.
2. Possible, especially if the car has sat for a long while.
3. Yes that is the best thing to do. Also replace the rubber fuel lines from the tank to the steel lines.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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