Spidey944

I've been tossing around the idea of removing all of the evap/emmisions related crap that is near the fuse box on the drivers side of the car. I know there is no gain to be had here besides weight removal. But it's not exactly the most asteticly pleasing assortment of crap to look at.

I know some of you racers have done this, has anyone done it on a street car? Our state inspections are very light for non OBDII cars and it's not like anyone knows what's supposed to be there anyway. I searched without many resuts, or maybe I just worded my searches wrong. Is it as simple as just removing all the stuff and vacuum lines related to the EVAP cannister or is there something I have to block off coming from the tank?

shiners780

It is basically as simple as removing the components and plugging any vac lines. I pulled the line running back to the fuel tank and stuck a small air filter on it to keep the line from getting plugged up with debris.

goldminer

I'm considering doing this over Easter. I did a search and printed out a good post. Search for for a post by sh944 on "Fuel vapor purge delete" in the 944 turbo forum.

MAGK944

Doug, its easy and well worth it for the anti-clutter. You will need to route some 1/4in fuel cable from just by the rear firewall by the engine to the air filter for fuel tank venting. Remove and blank, or just cap off the rabbits ears switch and I think that's it apart from some minor vacuum pipe re-routing and blanking-off. Did it on both ours, also got rid of the cruise control and added a LR breather that gets rid of a lot of stuff under the inlet manifold and also stops the oil fumes from gumming up your throttle, J-pipe and related stuff.

I shall post some pics tomorrow.

Mike

PS: Gina says thank you, she got the steering shaft Friday and will send to Borgeson tomorrow.

goldminer

What did you use to plug the lines?

shiners780

The vac lines? You can get rubber vac caps at your FLAPS. Stick on the appropriate size and zip tie.

mj951

I did this last winter, nice to clean up the engine bay a bit and slight weight reduction. Here is what I used.

1. From McMaster-Carr: part # 51115K605 it's an 8mm plug for vac line coming off the J-boot, 1 required.
2. From Pegasus: K & N Crankcase Vent Filter, part# KN 62-1330, 1 required.

I deleted the fuel vent line running back to the tank and added the K&N filter back there, used zip ties for fastening.

eniac

I removed mine 2 years ago along with the charcoal canister behind the fender. I also removed the tank vent line all the way back to the gas tank where I attached a small breather filter back there to keep any dirt out. I have had no issues with fumes nor any other issues related to removing the system.

Scootin159

https://rennlist.com/forums/944-turbo-and-turbo-s-forum/161841-fuel-vapor-purge-delete.html

potent951turbo

I have been wondering if you could just run the line from the tank that runs along the firewall straight to the charcoal cannister and pull out the rest of the stuff such as the purge valve and vacuum lines? That way the fumes would still be going into the cannister. Not sure if that would work or not?

Spidey944

I think the purge valve needs the vacuum provided by the engine to draw the fumes into the cannister.

84_944guy

So can you just cap everything off and use a vented gas gap?

MAGK944

Just extend the fuel vent pipe to the air filter, just before the MAF. There's enough of a vacuum there to draw any stray fumes and you will have a 'closed' system. Some states require this on the emissions test, i.e: you cannot vent to atmosphere. Unless it's a dedicated track car, this is the best option.

M

potent951turbo

Is the charcoal cannister sealed? I know it has a vent tube or some sort coming off it it just pointing to the ground. My thought was simply instead of using a filter on the end of the hose, what would be the difference if you just had it going into the cannister if it does indeed vent from that hose?

Spidey944

Because the tank will not vent into the cannister unless it recieves a signal from the purge valve to open. It can not open if you remove all the rest of the stuff under the hood.