65 GS Sending unit

[vbashers]

I’m replacing my sending unite and there seems to be at least two flavors of this beast. Vented and unvented. I thought I read somewhere that cars that came with AC had the vented unit. My car did come with the dealer installed AC. Anyway, I purchased a sending unit from TANKS.com and I received it and it is the unvented flavor. Can I run this? Do I need to vent the sender (is that old school and it’s not needed anymore?). I’m attaching a picture of the two.

Thanks for your help,
Jim

 

[Dr. Frankenbuick]

That’s actually a return line from the pump. It was used on AC equipped models to prevent a hot engine from vapor lock. You should have the rerun line type.


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[vbashers]

It's turning out to be difficult to find a sending unit with the vent. Ideas?

 

[Bob]

As far as relating the sending unit to the a/c, as your a/c was dealer installed, it is aftermarket and the dealer would not have changed the tank venting. I would expect your car would not use a vented sending unit. Your car probably has a vented filler cap.

As mentioned, the used sending unit you show has a return line from the pump, and you should use it. What you want is a sending unit with a return line, not like the new one you show. If the tank is vented through the sending unit for some reason (a possible vent is not seen in your image) and you install a sending unit without a vent, and the car is still running an original non vented filler cap (someone may have changed it after all this time), after some time it will stall from fuel starvation as the tank develops a vaccum. If you undo your cap the tank will suck a big gulp of air. The car will then start and run again.

 

[GL03]

It is not new idea to just make the sale. Wrong part are listed on daily basis on ebay, craigslist, big companies make profit on people buying the wrong part and not returning it. The retail market is notorious for providing minimal information to the consumer because theyd rather take that chance to make it $$$. Parts are out there and or repairable just takes longer to find. I ask lots of questions before buying.

putting a rag on the fuel filler neck because you wont get a cap is old school and so is the possibilty of car catching on fire.