Fuel return line plumbing.

[Wallus57]

Hi folks. Has anyone plumbed their return into the fuel fill pipe? It's a lot easier than dropping the tank to drill the sending unit and I won't have access to a garage soon. I'm a little worried about a siphoning effect while filling the tank too.
Thanks, Wally

 

[Don Frelier]

I don't see any problems with it.

 

[493 Mike]

I just read about a fitting to do what you want. It works like a rivet nut.
Mike

 

[mrmolding]

Not an expert on this at all, but I've read somewhere that the gas becomes bubbles if you go through the neck vs the sender. A return vent is different to the neck, but return fuel line to the neck is where I read this -- this could just be incorrect info but passing it along. I've had a 3/8 sender with the 1/4 return line on my shelf for a year until I get around to doing this officially. I stopped because I can't seem to find a repro sender that returns the correct resistance for my gas gauge. If you have success, please post your findings. I would love to see your solution.

 

[PurpleBeeper]

Not an expert on this at all, but I've read somewhere that the gas becomes bubbles if you go through the neck vs the sender. A return vent is different to the neck, but return fuel line to the neck is where I read this -- this could just be incorrect info but passing it along. I've had a 3/8 sender with the 1/4 return line on my shelf for a year until I get around to doing this officially. I stopped because I can't seem to find a repro sender that returns the correct resistance for my gas gauge. If you have success, please post your findings. I would love to see your solution.

Look for a "dolphin" fuel gauge adjuster. I just installed one, but haven't calibrated it yet, so I can't swear it works. It's small and has buttons inside & a screw adjuster.

 

[diesel_lv]

Is it for fuel injection or mechanical pump on carb? FI will flow a higher volume and psi and "possibly" cause a little aeration. If it's mechanical pump from carb, it'll trickle down fill tube to tank and be just fine.

 

[Wallus57]

Not an expert on this at all, but I've read somewhere that the gas becomes bubbles if you go through the neck vs the sender. A return vent is different to the neck, but return fuel line to the neck is where I read this -- this could just be incorrect info but passing it along. I've had a 3/8 sender with the 1/4 return line on my shelf for a year until I get around to doing this officially. I stopped because I can't seem to find a repro sender that returns the correct resistance for my gas gauge. If you have success, please post your findings. I would love to see your solution.

Thank you. I'll let you know but it'll be a month or so because I'm moving.

 

[Wallus57]

Is it for fuel injection or mechanical pump on carb? FI will flow a higher volume and psi and "possibly" cause a little aeration. If it's mechanical pump from carb, it'll trickle down fill tube to tank and be just fine.

Thanks for the information. It's a mechanical pump.

 

[mrmolding]

Look for a "dolphin" fuel gauge adjuster. I just installed one, but haven't calibrated it yet, so I can't swear it works. It's small and has buttons inside & a screw adjuster.

Awesome! Thanks!

 

[mrmolding]

Thanks for the information. It's a mechanical pump.

Ahh! That makes sense! Efi will bubble and mechanical is trickle. Maybe I’ll go the filler neck route as well. Thanks!

 

[68 Sport Satellite]

Hi folks. Has anyone plumbed their return into the fuel fill pipe? It's a lot easier than dropping the tank to drill the sending unit and I won't have access to a garage soon. I'm a little worried about a siphoning effect while filling the tank too.
Thanks, Wally

what car is it for - meaning, is the filler tube behind the license plate at rear of the car or rear side of car like the Charger?

 

[Wallus57]

what car is it for - meaning, is the filler tube behind the license plate at rear of the car or rear side of car like the Charger?

Behind the plate. 63 Savoy