Quote:
Originally Posted by dmjlambert
Well it seems you found the problem with the vacuum cap on the manifold missing. That is probably not related to your new or old gas cap. I have made a habit of hanging onto the old stuff I remove when I install a new part, at least until the new part is very proven to work well. So my advice is enjoy the new cap on the truck and hang on to your old cap for a couple months.
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Got rid of the new cap. I'll try the cap off the 71 tomorrow. Great timing too, the tank and front/rear windows are all that's in the cab and I pull the tank next.
Sounds like you're saying it was a coincidence. I thought perhaps some vapor exchange blew the cap off the vacuum port. I wonder why there was a gush of air (and gas) when I pulled the gas cap off? First I've seen that happen.