Vacuum leak on gas Allegro??
Hi Folk.... We have a 2005 Allegro on a workhorse platform and have noticed a hissing sound coming from the rear of the RV. Seems to be a constant vacuum leak or air pressure leak sound but every...
Forum Discussion
Argosy24 wrote:rgatijnet1 wrote:
If it only happens when the engine is running it could be from the fuel cap that is making noise as air is sucked in to replace the fuel being used. A new fuel cap may eliminate the noise.
The caps are sealed now as part of emissions, air to replace fuel used comes through the carbon canister.
That is exactly right, but suppose the seal is not good on the fuel cap. I assume this is something that has not been going on since the coach was new so it may be possible that the seal could have cracked or split on the fuel cap.