Jeff,
Ron will chime in to back me up, but if you've still got a plastic fuel cap, replace it with a new stainless assembly. Also, fuel is cheap enough that if you suspect contamination, it's practical to pump out the existing fuel and replace it with clean disel. You can remove the line from your secondary filter to the engine (the one under the sink in the head), and rig a 1/4" ID temporary line that will allow you to use your electric fuel pump to pump the fuel from the tank into jerry cans. If your tank is older than about 7-10 years, you might also think about pulling it and cleaning it out. There's quite a bit of Tech Note savy and other info in the Wiki section. Also, there's another phenomenon that I recently encountered called "wet disel" where there is literally too much water in suspension in the fuel--that is the result of additives. Fuel chemistry is beyond my limited mental capability, and after a couple of experiences I've become a fan of adding nothing to the fuel and just making sure that it stays resonably fresh. I've had more success with that approach than I have with getting the perfect chemical cocktail mixed in the tank (and this gets harder if your fuel supplier already pretreats the fuel!).
Cheers,
Vac
Ron will chime in to back me up, but if you've still got a plastic fuel cap, replace it with a new stainless assembly. Also, fuel is cheap enough that if you suspect contamination, it's practical to pump out the existing fuel and replace it with clean disel. You can remove the line from your secondary filter to the engine (the one under the sink in the head), and rig a 1/4" ID temporary line that will allow you to use your electric fuel pump to pump the fuel from the tank into jerry cans. If your tank is older than about 7-10 years, you might also think about pulling it and cleaning it out. There's quite a bit of Tech Note savy and other info in the Wiki section. Also, there's another phenomenon that I recently encountered called "wet disel" where there is literally too much water in suspension in the fuel--that is the result of additives. Fuel chemistry is beyond my limited mental capability, and after a couple of experiences I've become a fan of adding nothing to the fuel and just making sure that it stays resonably fresh. I've had more success with that approach than I have with getting the perfect chemical cocktail mixed in the tank (and this gets harder if your fuel supplier already pretreats the fuel!).
Cheers,
Vac