72 LT-1 fuel lines

[Sonny M.]

Second question on the 72LT-1.This car shows no sign of ever having a fuel vapor return line from the tank to fuel pump.All the holding clips on the frame look to be untouched originals.The fuel pump is not original.The assy. manual shows the vapor line. Any idea why its not there?

[Michael G.]

Re: 72 LT-1 fuel lines

Sonny, I'm not so sure the LT-1 did not have a vapor return line

[Terry M.]

Re: 72 LT-1 fuel lines

Second question on the 72LT-1.This car shows no sign of ever having a fuel vapor return line from the tank to fuel pump.All the holding clips on the frame look to be untouched originals.The fuel pump is not original.The assy. manual shows the vapor line. Any idea why its not there?

I am sure NO LT-1 had a vapor return line on the passenger side of the car. In fact that is one of the LT-1 clues.

Where in the AIM are you seeing a vapor return line for the LT-1? Surely NOT in the LT-1 section.

[Jack H.]

Re: 72 LT-1 fuel lines

Agree! The key is Holley vs. Rochester/Carter QJet carb use. There wasn't a provision for fuel line return on Holley carb equipped cars in that era.

Even in earlier years, savvy judges use the presence of reminants of a fuel return line to detect 390 HP BB cars that have been 'converted' to tri-power BB configuration...

[Terry M.]

Re: 72 LT-1 fuel lines

Agree! The key is Holley vs. Rochester/Carter QJet carb use. There wasn't a provision for fuel line return on Holley carb equipped cars in that era.

Even in earlier years, savvy judges use the presence of reminants of a fuel return line to detect 390 HP BB cars that have been 'converted' to tri-power BB configuration...

Jack you have to get up early in the morning around the early C3 Corvettes.

This fuel vapor return line is not as simple as Holley or non-Holley. The 1971 LS6 (and ZR2) used a Holley and a fuel vapor return line. LT1 and ZR1) (any of the three years it was available did not.