eb110americana

iTrader: (4)

EDIT: The short version, for those of you with a 1999-2002 LS1, do you have 3 fuel lines coming up from under the hood, or 2? If only 2, is there a T-block like this near the fuel filter?



The long version is that I think the manual I am looking at is wrong, and shows the V6 version for both V6 and V8 cars after 1999. Below is what I wrote before I came to that conclusion.

I swapped my 1998 metal fuel tank to a 1999-2002 plastic gas tank. Everything connected up perfectly. I haven't started it up yet though, as the engine is an LS3 that is not in the car yet.

I thought all was good, until I found these diagrams of the two systems. I swapped my tank, pump, evap system, and the plastic lines coming off the tank, but I did NOT swap the metal lines that run down the center tunnel. Do I need to pull fuel lines from a newer car as well?








It would appear that there is one more line terminating at the engine on the 1999-2002 cars, but I do not even know where that would go on the LS3. The tank itself has 3 plastic hoses for each variant, but it looks like they connect like this:

1998:
1) Fuel out (through filter)
2) Return "FRT" (pump to "T" block after filter)
3) EVAP line from canister

1999-2002:
1) Fuel return line???
2) Fuel out (through filter)
6) EVAP line from canister


For the later model system, I cannot find any pictures which even show line #1. Is this just for the V6 cars? If so, the stupid GM parts manual is wrong. Is the above picture accurate?

RockinWs6

99 up V8 uses the top with the T with 2 lines going forward, 1 LINE IS FUEL other is purge canister vent to the purge valve on the intake.

RockinWs6

The diagrams are right, mf03-113 is for v8.

eb110americana

iTrader: (4)

Thanks. If your first post is correct, RockinWs6, then the diagrams are wrong.

Notice that the "T" line one is listed for the 1998 LS1 only. The 3 line one is listed for all cars 1999-2002, including V8s, which it should not. It should say V6 only, and there should be a separate one for V8s after 1998, but there is no such page in the manual.

RockinWs6

Odd I see what you mean, the 99up is 2 lines fur sure cause I worked on a bunch with bad rotted out lines.

eb110americana

iTrader: (4)

Thanks, wasn't sure at first, but the more I started looking, that seemed likely. So if any future tank-swappers come here in search of the fuel line routing, all LS1's use the returnless 2 line fuel lines with the T-block next to the fuel filter, only the tank hardware changed in 1999, along with the location of the charcoal canister. The images from the manual above for 1999-2002 are for the 3.8L V6 model only.