Return Line Routing

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Tims 66 Cuda

Tims 66 Cuda

Mopar mid life crisis
Joined
May 28, 2018
Messages
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Location
Poquoson, Va
The sending unit on my 66 Barracuda tank has two out lets. A3/8 for fuel to the pump and 5/16 for a return I guess. Is the 5/16 for a return or not, as I,m trying to install one to avoid a vapor lock/ fuel boil issue. Any help appreciated.

Tim
 
AFAIK there was no return on any '66 A-body, nor did any have a 3/8 feed. Most likely someone replaced the sending & pickup unit.

Vapor lock can be minimized by using the factory routing, carb filter position, and try not to have any winter fuel in the tank when the weather is warm. I know the last can be tough since hot spells often hit us in the NE well before the change back to summer fuel.
 
Usually a 1/4" return spigot... on senders with one. It's definitely not OE
 
If I remember right it was an OER from Classic Ind and was supposed to be for the early A tanks. Ive been running with the smaller port blocked off.

Tim
 
For clarification's sake, there was never a SOLID FUEL return system on our Mopars. There was, however vapor return. I'm getting ready to run a return line on my truck, Gladys. I'm just going to run right beside the existing fuel line from the tank right to the engine bay.
 
Thats what I did Rusty, I ran a 5/16 steel line along the existing fuel to the engine bay just under the alternator. I tied in to a filter with restricted outlet and to the smaller port at the sending unit. My question is this correct?

Tim
 
Tims 66 Cuda said:
Thats what I did Rusty, I ran a 5/16 steel line along the existing fuel to the engine bay just under the alternator. I tied in to a filter with restricted outlet and to the smaller port at the sending unit. My question is this correct?

Tim
Click to expand...
Yes.
 
Well now my problem seems to be no fuel pressure when I turn it over. Ill check the fittings again a go from there.

Thanks Tim
 
Tims 66 Cuda said:
Well now my problem seems to be no fuel pressure when I turn it over. Ill check the fittings again a go from there.

Thanks Tim
Click to expand...

You might see very little pressure when cranking because the return is bleeding it off.
Betcha see pressure running.
 
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