After filling up my 2003 Transit campervan with diesel the other day, I noticed that the fuel gauge was very slow to respond: after 10 miles it showed 3/4 full, but eventually came up to the 100% line. It hasn't done this before. Is there any cause for concern?
In case it changes anything: this was the first time I'd filled it up in about 6 months. I only drive about 50 miles per month regularly, and couldn't even do that over summer because of an injury. I normally fill up when it gets to about 1/4, but left it until about 1/8 because I was hanging on for somewhere cheaper.