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Chevy Resto Tech - March 2014

Mark Lundquist Feb 12, 2014
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Got a restoration question that's been puzzling you? Send it to:
[ m ] Super Chevy, Resto Tech, 9036 Brittany Way, Tampa, FL 33619.
[ e ] superchevy@sorc.com [ f ] 813-675-3557

Tip of the Month

Fuel smells in your shop or garage can be unpleasant and annoying, not to mention dangerous. Case in point is our '68 Camaro. After filling the fuel tank, we were getting a definite fuel smell in the shop. The culprit was traced to a faulty fuel tank sending unit. Sometime during its life the pickup tube had broken loose from the sending unit and was leaking fuel when the tank was filled. Changing the sender is relatively easy. Disconnect one fuel line, take down the tank straps, drop the tank, and replace the sending unit. Sounds easy doesn't it?

Well, on the '67 and '68 Camaro, the filler tube is connected to the top of the tank with a rubber collar that clamps to the filler neck and the tank itself. Getting the clamps loose to remove and reinstall the tank is almost impossible. What you see in the picture is the opening where the filler neck attaches to the tank in the trunk area via a rubber collar with a clamp on both ends. To save wear and tear on your hands and temper, we simply punched a 1-inch hole to allow us to loosen and tighten the top clamp on the filler neck. The bottom clamp can be installed and tightened on the tank side before installing the tank. After all is installed and secured, a rubber plug can be snapped into the 1-inch hole for a factory look. It's no wonder they changed the filler neck in '69 to a one piece unit exiting behind the license plate. Two years too late for me.

Department of Corrections

We received a few letters concerning a mistake in the December '13 column. I inadvertently read Bobby Green's as a '69 Nova. The letter was concerning the removal of his '67 Nova windshield. The procedure I described was for a '69 Nova and not the '67.

Basically, on the 67 with a conventional windshield with a non adhesive seal, it's only necessary to cut the seal on the inside and carefully push the window out. On the '69, which has adhesive, you have to cut through the adhesive as described in the December issue, or risk breaking the windshield.

I'm A Fan

After reading your MSD Atomic install article several months ago, I decided to take the plunge and finally upgrade my '72 Chevelle from the old carb to fuel injection. My Chevelle has a 454 with A/C and a Turbo 400 trans, and is cooled by a Be Cool radiator with dual Spal electric fans.

My problem arose when I tried to use the Atomic EFI feature to control the fans. The system allows you to program two fans to come on at a temperature you set. Each fan can be set at a different temperature to turn on. The MSD directions tell you to hook up the tan and pink wire to each fan relay ground circuit.

The problem is the number one fan runs all the time no matter what temperature I program. The number two fan works fine with the temp I program. The relay for the number two fan seems to be grounded all the time leaving the fan in the on position. I have switched the relays and still have the same problem. Help!

Ron Steins
Via Email

Ron, if you check the EFI harness at the throttle body, you will find an orange wire at the harness connector. This wire is an optional idle kick up feature for cars with A/C. It should run to the A/C compressor power wire. When the A/C is turned on, the orange wire energizes the fan for extra cooling while raising the idle to compensate for the A/C compressor load. I think you will find either the A/C is on all the time or you have connected the orange wire to a constant 12-volt source. Check it out and let us know. Also, you can call MSD support at 915-857-5200 for additional help.



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