Gas Tank "Sending Unit" - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 21st, 03, 05:57 PM Thread Starter
 
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Have a 69' Coupe and I just installed a new gas tank and sending unit. Existing sending unit fuel lines didn't look so great so I thought it be a safe idea to replace them and the tank also. The problem I have is the fuel gage reads an 1/8 of a tank with exactly 10 gals. of gas in tank. I made sure the sending unit measured 0-90 ohms linear through its travel before tank install. With the 10 gals. in tank the resistance reading is 6 ohms. Also I used a variable test resistor to check the accuracy of the dash gauge. 45 ohms= 1/2 and 90 ohms= full. I took a physical depth measurement of the tank which is approx. 8.5". The old and new sending units both have the suction tube at about 5.5" below the top flange piece that locks into the tank. Actually the old sending unit and tank setup didn't read accurately either.
Is this a common thing for this car?
It seems that the design should have had the suction tube and float assembly approx. 4-5" longer to reach close to the bottom of the tank.

Restored Dover White 69 Camaro SS350 stock with the "dual" fuel line setup.
Thanks, Ray...........
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post #2 of 5 (permalink) Old Mar 21st, 03, 09:19 PM
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You don't want the fuel pump sucking all the possible sediment, so it's better to have an unusable fuel sump. as for the sender, just bend the float rod.
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post #3 of 5 (permalink) Old Mar 22nd, 03, 04:34 AM Thread Starter
 
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8-10 gallons of fuel is quite a bit of unusable sump. Does any one ever notice that you only put approx. 8 gals. of gas in the tank when you fill up. I love my Camaro but what a brillant design from GM.
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post #4 of 5 (permalink) Old Mar 23rd, 03, 01:30 AM
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[QUOTE]Originally posted by rbks50:
Actually the old sending unit and tank setup didn't read accurately either.

Ray, your problem sounds like it may be with the gauge. I have a new tank & sending unit in my 69' and went for a ride yesterday with a little less than a 1/4 of a tank I stopped and put $10 dollars of high test in @ $1.90 a gallon = 5.2 gallons and my gauge went up to half. It works fine. I don't believe there is a 8 to 10 gallon "cushion" for the sump in an 18 gallon gas tank.
Good Luck, Drew
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post #5 of 5 (permalink) Old Mar 23rd, 03, 03:35 AM
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I have a similar problem, I just replaced the fuel tank and sending unit in my 69, and both times I have filled it up so far, the gauge will only go up to about 1/2. The first time, it took about 10-15 miles, I hit a bump, and it went up to full. The second time (yesterday), I drove it about 10-15 miles, and the guage still is stuck at 1/2 full. Stuck float? Probably, but this really irritates me, brand new reproduction parts, and it still doesn't work right. What am I supposed to do, drop the tank and "oil" the sending unit? Guess I'll live with it.....
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