Single Fuel Line vs Vent Line - Team Camaro Tech
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post #1 of 3 (permalink) Old Jan 13th, 02, 10:38 AM Thread Starter
Join Date: Aug 2001
Location: Lawrenceville, PA, USA
Posts: 13

I am wondering if anyone can help me. I just bought a new sending unit for my 79 Z28. It only has a single fuel line. The original had the fuel line and a return line. However, the motor is no longer stock, no emmission equipment (no vapor can). So the vent line was plugged on the car when I bought it.

My question is can I use the single fuel line sending unit?

I imagine I will need a vented fuel cap since I don't have a vent line to the tank. Is this correct?

Does anyone know if the 79 Z's had a vented cap?

And while I am asking, why would an automatic transmission car have a different fuel sending unit than a manual transmission car? I have a 4spd and the auto trans sending unit was almost $80 more.

Any ideas would be great.
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post #2 of 3 (permalink) Old Jan 13th, 02, 10:55 AM
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Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305

did they also ask you what color your interior was? i got that at a parts store once when i was getting a transmission filter. i think sometimes they make up different part numbers for simple things like that to make a few more bucks.
you said that the vent line was plugged on the old one, so i would imagine that you wouldn't need a vented cap for this one.

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[This message has been edited by novaderrik (edited 01-13-2002).]
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post #3 of 3 (permalink) Old Jan 13th, 02, 12:36 PM
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Location: Washington, Michigan USA
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If the nipple for the old vent line is plugged (capped) on your tank, you'll need a vented cap; with a non-vented cap, as your fuel pump sucks fuel out of the tank, there won't be any air to replace it, and it can gradually collapse as a vacuum is created inside the tank.

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