Re: diesel fuel Oh, I forgot something. Have you ever seen the inside workings of a fuel pump at a station? They have filters in them to pull out sediment that is very small. Looks like a big oil filter that screws onto the pump. If they get clogged the pump shuts off until the filter is changed. Also they are required by law, don't know if it is state or federal, to test the tanks for moisture and sediment. Most states have a seal that is put on the pump once a year verifying that the pump has passed certification. And the new inground tanks are fiberglass. In other words, I agree the Ford dealer was just pointing a finger.