elzarco

hello guys, i got a 98 ls1 camaro i did the whole trap door deal, but noticed after i finished that the bracket that bolts down the pump in place is bolted on tight, i am still able to grab the pump by the steal lines and move it side to side... is this normal or something wrong here?, im getting a strong raw gas smell out of the tank so i figured fumes coming out of that 'play' the pump has. also wanted to know why i have 4 lines coming in to the pump when 99+ ls1s have only 3.. THANKS!

Lonnies Performance

iTrader: (16)

Sounds like you forgot to install the pump o-ring under the sender?

roninhdz86

No. The funny thing is that the o ring is there I lubbed it with vasoline and the plate that covers the pump is real tight

Zbinkley

Im also curious about the four lines going into the pump?? Im gonna do some investigating tonight, ill let ya know.

aerojt

iTrader: (4)

Does there happen to be a write up on doing the trap door setup? Sounds like something that wouldn't really hurt the vehicle but also be beneficial long term... Thanks!

Lammy

https://ls1tech.com/forums/fueling-i...ow-thread.html

04gto5.7

The 98 ls1 cars had the older style that which is all metal the I wanna say 99 maybe 00 had a plastic tank maybe thats why

Ollie8974

04gto5.7 is correct, the opening is smaller. If you are installing the LS1 plastic fuel pump module the opening needs to be increased. This is a link ti a vendor who offers the correct opening modification for the metal tank.
http://www.vetteworksonline.com/ls1_conversion_fuel.htm

elzarco

i called airtex and they told me that year model had 2 vent lines instead of newer ones having 1

Zbinkley

One is a pressure line, one is a vent line, one is a return line with a regulator built inline, and one goes to the charcoal canister. The pressure line tees off right after the filter and goes back into the port with the regulator, so it is a return less style system that is deadheaded at the fuel rail. The second line going into your fuel rail is a purge line that. Purges gas vapors coming from the charcoal canister into the fuel rail to be burned away.