I strongly suggest that you blow compressed air through the fuel line from the engine end... the line is clogged most likely and rust and scale is the most likely culprit. Also did you use any silicone? If so it may be getting through into the fuel line and swelling. Checking your fuel pump is the most obvious place to start, but still blow some air through anyhow to clear the line . Leave your fuel cap off for this operation and be aware that fuel may spray from the tanks filler neck.....Be aware also that if you choose not to stick with the limitations of your fuel tank as far as rust and dents go that there is an alternative... My FC ute is fitted with one of my stainless tanks that we are selling that are a direct replacement for an original - this gives a 58 litre capacity and is a bolt in operation with no mods required. Cost is at present $695 for the whole deal and includes new sender - matched to your guage and all mounting hardware is supplied . However if you decide to stick with your original then follow the above advise and you will be OK .. Cheers streetneat.....