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+--- Thread: Fuel tank venting (/showthread.php?tid=4851)
Fuel tank venting - Torkey - 08-27-2013
Had a great race this weekend. Car ran flawlessly for 16 hours. However, on the second day of the race we noticed that the fuel jugs were delivering fuel quicker than the tank could take it in. I checked today and the check valve is ok but the tank vents slower than it has in the past.
We got some bad fuel at the last race and I'm wondering if the vent thingy in the tank is obstructed.
I tried using compressed air to clear it out but it was unsuccessful.
Nothing in the FSM on how the venting system inside the tank works.
Anyone have any info on this?
RE: Fuel tank venting - MFSuper90 - 08-27-2013
If your worried about it just put a couple vents in it. That's what I would do at least
RE: Fuel tank venting - Torkey - 08-27-2013
Fuel tank mods are frowned upon and are very difficult to get through inspection. Those guys worry to much about Car-BQ's.
I might have to go that route but I am hoping to get the stock vent working properly.
RE: Fuel tank venting - willbhere4u - 08-27-2013
hope this helps
should be the same w123 and w126
RE: Fuel tank venting - raysorenson - 08-28-2013
As I understand, fuel enters the tank when filling at a higher rate than the vent, or it's plumbing, is designed to flow. Most vapor is going to come out of the filler neck, hence it's huge diameter.
RE: Fuel tank venting - Austincarnut - 08-28-2013
(08-27-2013, 03:07 PM)Torkey Had a great race this weekend. Car ran flawlessly for 16 hours. However, on the second day of the race we noticed that the fuel jugs were delivering fuel quicker than the tank could take it in. I checked today and the check valve is ok but the tank vents slower than it has in the past.
We got some bad fuel at the last race and I'm wondering if the vent thingy in the tank is obstructed.
I tried using compressed air to clear it out but it was unsuccessful.
Nothing in the FSM on how the venting system inside the tank works.
Anyone have any info on this?
why not seal it and then pressurize it, maintain pressure throughout the race w/ a regulator and co2 bottle?
RE: Fuel tank venting - Simpler=Better - 08-28-2013
Can you modify the fuel jugs to have a vent pulling vacuum and in addition to the filling nozzle? Way more complicated than a larger vent but it doesn't modify the tank.
Can you use one of JB3's plastic tanks?
RE: Fuel tank venting - Torkey - 08-29-2013
(08-28-2013, 08:30 AM)raysorenson As I understand, fuel enters the tank when filling at a higher rate than the vent, or it's plumbing, is designed to flow. Most vapor is going to come out of the filler neck, hence it's huge diameter.
Indeed it has a huge diameter and our fuel jugs use almost all of it. One of the reasons we can put in 5 gallons of fuel in about 20 seconds.
RE: Fuel tank venting - raysorenson - 08-30-2013
Newer cars have much smaller diameter filler pipes with a small line (~8mm O.D. metal) running parallel to the filler that enters the filler neck just behind the fuel cap. This allows the displaced vapor to exit the filler neck without having to travel the distance from the tank against the flow of fuel.
Running a similar line from the vent plumbing to just behind the fuel cap might help. Once the fuel cap is in place, the vent system will essentially function as before.
RE: Fuel tank venting - Torkey - 08-30-2013
(08-30-2013, 12:14 PM)raysorenson Newer cars have much smaller diameter filler pipes with a small line (~8mm O.D. metal) running parallel to the filler that enters the filler neck just behind the fuel cap. This allows the displaced vapor to exit the filler neck without having to travel the distance from the tank against the flow of fuel.
Running a similar line from the vent plumbing to just behind the fuel cap might help. Once the fuel cap is in place, the vent system will essentially function as before.
Now that is brilliant!