87tpi

iTrader: (5)

I need a new purge solenoid for my charcoal canister because my fuel tank is building excess pressure causing my fuel pump to start screaming pretty loud.Now,till I get the new solenoid,would it be a problem to run the hose that goes back to the tank directly to the throttle body so it routes that pressure back to the engine?

tenpin842

I have a 87 and I took mine right out when I put header and a SLP air induction box on. Unless you have emissions problems where you live.

MattODoom

iTrader: (1)

I took out my canister, the wiring, and the steel line that goes to it and just capped it off where it comes out of the tank.

I would think you could run it into the throttle body but you might get a huge buildup of exhaust fumes in the intake. But its not like the intake is air tight.. itll just pass by the throttle blades if it builds up too much.

EDIT: It just occured to me that hooking it up to the throttle body would put vacuum to it. You might have some problems there. You can just leave it vented to open air.

MdFormula350

thats the better soultion than capping it off completely i think.



i used a small filter an idea someone told me on here.

3.8TransAM

Either keep the system intact and working properly.

OR

block the lines off and run a vented gas cap

U need a system to vent pressure from the tank(either cap or canister) and to allow fresh air into the tank(fuel tank vent valve)

Just dont block things off haphazardly or you'll be replacing a fuell pump before you know it.

Also, depending on vehicle type and driving habits, a proper functioning canister purge system can be worth 10-11% mileage, just something to think about.

later
Jeremy

MattODoom

iTrader: (1)

I did not note any measurable decrease in mileage after removing the canister.

So.. what does the UFO under the axle do, is that an air inlet valve? Or is it a pressure release valve? Let me know so I can go replace my cap with a vent if need be. When I take my cap off there is no pressure though, so my tank seems to be vented somehow.

3.8TransAM

Well put it this way, what is better?

Containing and using vapor from gas or wasting it to free air?

Gas has a pretty good tendency to evaporate to nothing, pour some on the ground or let a cup of it sit outside.

The fuel tank vent valve is a one way valve to let air in to make up for the displaced(used) gas.

It is contained and vented thru the purge system(canister).

So if blocking the purge system, use a vented cap. I dont like leaving it open under the hood as you have gas vapors filling your engine bay.

later
Jeremy

tenpin842

Yes, I agree. I blocked it off. But put a vented cap on. I didnt want gas fumes in my motor compartment.
Everybody was telling me to vent it out. I'm like then I'll vent it through the gas cap.

MattODoom

iTrader: (1)

Can i grab a vented gas cap at the local auto parts store? How much $?

87tpi

iTrader: (5)

They're like 8-10 bucks.at any autoparts store.