disasterman

At the track this weekend, my 951 was spilling large amounts of fuel out of the filler cap on right turns. This happened down to the point of just over half tank. I ended up running at well under half for each session to prevent this from happening.

Weather was 70 to 80 degrees and dry.

This did not happen with the first fuel load, it started with the second tank at the end of the day (I did not overfill).

Geoffrey

Check to ensure that your fuel tank is venting properly.

aeshultz

Happened to me on my NA '83 - ended up replacing the cap and the entire filler neck to get it to stop.
Good luck - it makes people a bit nervous!

Scootin159

happened to me... new gas cap fixed it.

Garen

... So you ran on Saturday then? Good to hear... I agree w/ Geoffrey. I'd look at the venting as well.

-Garen

disasterman

Sorry you were'nt there. I had a great weekend. We stayed through the all of the races on Sunday, Mary was working with SEMPCA people. Molzon showed up and rode with me (so did Jeff) on Saturday as well.

Z-man

Been there, done that... Used to have the same problem, but now nothing leaks out the top, even at AX, where more sloshing can occur.

Query - do you see streaks of gas on the side of your car behind the filler cap? That was my issue.

A new gas cap may or may not fix it -- after 20 years of filling up, the aluminum top of the filler neck can become 'out of round.'

But a new gas cap is the place to start. When putting it on, make sure it is tightly on. I turn my gas cap back and forth a couple of times to ensure it is tightly on there. Also: it may take some time for the gasket on your cap to breathe and swell a little and finally seal the filler neck properly.

-Z-man.

disasterman

Fuel marks all over the outside. I don't think it's the cap because the first full tank of gas did not cause a problem.

Cory M

+1

Z-man

Full tank and not spilling kinda makes sense, since the gas can't slosh around as much when it is full.

Start with replacing the gas cap - use OEM, not aftermarket. (I tried aftermarket first, and it was worse.

-Z-man.

disasterman

Replacing the ca is an inexpensive way to start. Simulating the leak situation (extreme corning) should be fun on the street.

RICHVIZZ951

Ive been there as well, always helps to have an extra fuel cap in your spares pile.. likely will solve the problem... cheap easy fix, gotta love it.

APKhaos

^ +1
My student at the Glen had the same problem, and a new gas cap fixed it immediately.

disasterman

Thanks for the input. I will order today.

RICHVIZZ951

order 2