Net Seven

iTrader: (5)

I bought an FD that is setup with two fuel pumps. I noticed that during hard cornering it smells like fuel, more so when the tank is full. While my car was on a lift, we checked out the charcoal canister and noticed that both the lines running to it and from it are cut. I'm not sure why someone would do this, but I'm sure it's the source of the fuel smell.

Last week, I was checking the wiring on the fuel pumps and removed the metal plate cover that seals the car's interior from the outside. I then drove it with the cover removed and the smell was much worse, so that confirms that is the source of the fumes

Since I will need to do something, what is the best option? Reconnect the charcoal canister and have it vent to the outside? Does that help with fumes though? Other option is to seal of that vent nipple from the gas tank and use a vented gas cap.

Any thoughts?

TomU

iTrader: (11)

The charcoal canister is part of a system

Net Seven

iTrader: (5)

Yes, but my car doesnt have any emissions including that purge control solenoid valve. My other FD also doesn't have them either, but the vent line is routed through the canister and to the engine bay area, however I never smell any fumes.

Net Seven

iTrader: (5)

I was also thinking of something like this:

https://www.fillernecksupply.com/5-1...ollover-valve/

TomU

iTrader: (11)

Not sure what that would do for you. Sounds like your tank is already vented (to the atmosphere) and that would just be a redundant vent. If you've deleted the purge control, you could hook the charcoal canister direct to the intake. As stated in the FSM, the purge control limits AFR spikes, but not sure how much of an issue that would really be if you were to just connect the charcoal canister direct w/o the solenoid (but with a check valve).

Or you can continue to let it vent to the atmosphere as-is. Think the only advantage of the vent you linked is the ability to close in case of a rollover. If you wanted that feature, you should block the existing vent

And make sure the fumes is the vent and not a leak

Net Seven

iTrader: (5)

I think my vent needs to be mounted higher. If you read the instructions for this aftermarket vent, it states:

"f you are running a vent line it is important that the line is ran higher than the highest point on the tank including the fuel filler neck. Also, the vent line cannot have a dip in it where fuel or condensation can get trapped in the line. If fuel becomes trapped in the line your tank will then build pressure or vacuum until there is enough pressure to purge the vent which will cause gas and/or odor to come from the vent line. If enough pressure builds up damage could be caused to your tank."

Based on that, I might have fuel splashing out from the top of my fuel tank vent line, since that's where the line is cut. That location is for sure, no where near above the fuel filler neck.

TomU

iTrader: (11)

What "vent" is the fuel splashing out from? The factory system has check valves. Are they deleted?

Net Seven

iTrader: (5)

Good question. Couldn't find anyone to hang on underneath my car to look when I cornered.

Point of my thread is to see what others have done. Like I mentioned, I don't have emissions on my FD, like most of them on the road right now. I am not interested in adding the emissions back nor am I going to plumb the vent into my intake manifold. I am looking to hear from people who have removed emissions and/or the charcoal canister and if they had similar problems and what they did.

billyboy

No need for anyone to be underneath, check valves should be visible attached to the pump hanger cover. Interestingly, late cars deleted the separator tank entirely.

No idea how to prevent the stink without the system, LH turns in particular, with the breather lower than the other side will undoubtedly have fuel pissing out if fuel level is high enough.

TomU

iTrader: (11)

Don't think adding another vent will help fix your fuel "splashing" problem

You can either try to fix your problem or keep stabbing in the dark

Net Seven

iTrader: (5)

Not adding, but rerouting the cut hose (existing vent) that goes to the charcoal canister to a higher placed vent instead.

Net Seven

iTrader: (5)

Both those check valves are there. They are check valves, so they allow flow in only one direction, which in this case is out of the fuel tank. Do they have some type of control that only allows vapors to flow out vs raw fuel? Otherwise why would place a separator right after them?

I don't have a full tank anymore and took the car out for a drive. Didn't notice much smell during cornering this time. This is why I'm thinking if I run the hose that is supposed to go to the charcoal canister, to a higher placed vent instead, might solve or at least help wit the issue.

billyboy

As said, the late cars have no separator tank just a line loop, a tee and the two check valves. The old system had one valve on one side of the separator and another on the run to the charcoal canister. They're entirely passive, only control was the solenoid under vacuum drawing the stuff into the manifold.

You might be right to consider a high placed vent, on some race cars here, the venting mechanism sometimes used was something along the lines of a toilet S bend. The vent hose followed the main rollcage hoop up, across the car and then down below the tank, exiting external to the car (closed vehicles). Idea being, no fuel spill/fire if you tipped the thing over.

billyboy

Here's the late system, even changed the steel hard line part to plastic to save a few pennies -

Net Seven

iTrader: (5)

Ahh interesting.