1970 -6 Gas Tank Supply Pipe Hose Bead Question, Morphed into: “Does the OE fuel return system cool fuel going to engine?” uh … No Options

[Rufus]

Hi Folks - I have the entire fuel system out of 9140431482 back to the Webers for update, cleaning, etc. (Webers already reinstalled after thorough cleaning.) The gas tank fuel outlet pipe has no hose bead.

Is this normal? Seems odd there wouldn’t be one.

Thanks,
Bob

[Rufus]

IMHO putting the return back in will increase fuel temp; not reduce it.

[brant]

IMHO putting the return back in will increase fuel temp; not reduce it.

Nope

Fuel sitting above the motor gets hot
Having a return lets the warm fuel back into the cool reservoir of cool in the tank
The fresh fuel from the tank is cool


In racing they even sell a fuel tank you surround with ice to lower the temp further

Cool fuel makes more horsepower
Warm fuel boils and creates vapor lock

A return line absolutely cools the fuel without any doubt

Carb cars respond even better to cool fuel due to the lower pressure of a carb system

FI systems have reduced fuel boil and vapor lock due to the high pressure they operate at

A return system/line was the factory design
They did this for a reason Even on a carbed 914/6



Few people outsmart the factory engineers