If its leaking or has been bent or crushed it needs replacing.
If the filter is mounted in the fuel tank, no. It is replaced when the fuel pump is replaced. If the filter is mounted in the fuel line it should have been replaced every 50,000 miles.
Air in the fuel line?? There is a filter in your tank that may need to be replaced.
Need to know what you are working on. YEAR AND ENGINE SIZE.
The fuel pump, and filter will need replaced. The tank will need cleaned out. The lines will need cleaned and the injectors may need replaced.
You'll need to reair the fuel line by replacing the fuel line .
Just turn on the ignition and the fuel pump will build up pressure. In rare cases you may need to use a starter fluid to start the engine until it primes the fuel line.
If the diesel fuel "gels" then yes the filter will need replaced.
need to no the fuel delivery line on 89 chevy truck fuel pump
No, it is mounted in the fuel tank and should last the life of the fuel pump. It is replaced when the pump is replaced.
A fuel return line should flow freely back to the tank. There may be a check valve on the fuel return line that prevents backflow from the tank to the regulator.
No, Only the supply line has to be submerged in fuel.
If, with power applied, the pump provides sufficient fuel pressure at sufficient volume, then it does not need to be replaced. Otherwise, it does.