fuel pump for 1964 327 impala - Impala Tech
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post #1 of 5 (permalink) Old 09-07-2018, 05:57 PM Thread Starter
 
 
Join Date: Apr 2010
Location: Illinois
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fuel pump for 1964 327 impala

Hi, I just got a replacement fuel pump, Carter M3120 and it has an extra pipe coming out of the top, what do I need to do with that?
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post #2 of 5 (permalink) Old 09-07-2018, 06:41 PM
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Welcome to the Team!

Sounds like your pump has a return line. If your car didn't come with a return line then you have the wrong pump as Carter makes two versions of the Chevy small block pump; one with a return line and one without.

I don't know if it was a California thing or just a Rochester QuadraJet for certain car bodies, but I have seen return lines on full size and Chevelles but none on Camaros or Novas.

Big Dave
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post #3 of 5 (permalink) Old 09-07-2018, 07:22 PM Thread Starter
 
 
Join Date: Apr 2010
Location: Illinois
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I don't think it is another line, it is less than 1/8" in diameter. The directions that came with the pump called it a flame arrestor vent tube and said something about marine use?
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post #4 of 5 (permalink) Old 09-07-2018, 10:55 PM
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Unusual. I used to test those at UL Marine labs when they where still located in Tampa. Has a bras screen inside to absorb any heat of a back fire or other ignition source to prevent a gasoline fire in the bilge.

I saw three holes drilled in the standard fuel pump to vent the diaphragm which I assume you don't have having an external vent line (that would go above the gunnel on an inboard OMS stern drive to rid the bilge of gas fumes).

It won't hurt a thing to leave it as is for a car application. It will prevent igniting your oil pan if you ever drove through a forest fire out west. Otherwise it just drives up the price of the part with the added work done to obtain a UL-Coast Guard rating.

Big Dave
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post #5 of 5 (permalink) Old 09-08-2018, 06:51 PM Thread Starter
 
 
Join Date: Apr 2010
Location: Illinois
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Smile Thanks

Thanks for the insight, I have bought 3 of these and returned the first two because no one would tell me if it was safe to use.
Your explanation gives me the confidence to finally replace the pump.

Thanks again for your insight, Bob
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