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Check the fuel filler cap is correct and venting as it should . Check for blockage in the fuel line pick -up in the tank as it is a fine metal filter that rusts and blocks the fuel flow to the pump.. I take it that by you statement of diesel fuel solenoid that it is a diesel engine. To that point the fuel tank runs at an elevated temperature and when cooling gets water condensation in the tank. This promotes moss growth which gets through filters and generally reduces performance of pumps and injectors.. However it will block the pick -up filter as I said. If you find this to be the case the moss is treatable with compounds put in the tank. To prevent a re-occurrence simply keep the tank full and never less than 1/2 full. NO air space = no condensation.= no moss.
I am guessing that your truck is a Diesel. There is no electric fuel pump on the diesel models. The fuel filter light comes on when there is not enough fuel pressure. Possible problems include the selector vavle not fully switching, and/or an obstruction in the pick up in the front tank.
the selector valve is located underneath the truck on the inside of the frame rail on the drivers side If I remember right. Try swtiching to the front tank and tapping the selector valve assembly. If that clears up the light then the selector valve is sticking and needs to be repaired or replaced.
Sounds to me like you're sucking air...does the FUEL FILTER light come on at all? Could be an "O" ring inside one of the quick connects on the fuel line selector or at the tank (if it does it on both tanks, it's the selector valve). Other than that, track your lines all the way up to the filter...if any look rusty at all, it could be sucking air from there....it doesn't have to leak to have a hole in it. The other issue you may have is the "sock" on the end of the feed line for the sending unit in the tank could be old and brittle or clogged up. Give all that a try....
try loosening the injector lines a little then crank it.it probably has air in the lines and wont blow through the injectors,once fuel comes out while cranking,tighten them,if this is the problem it should start but run rough untill the lines are tight,it shouldnt hurt much to get a little fuel on the engine
well, first, to find out if its the in tank fuel pump or the tank selector valve, the cheapest and probable easiest thing to do is find the selector valve under the truck and switch the incoming fuel lines. front tank to rear tank inlet, and vice versa. If the truck still doesnt run, you either have an electrical delivery problem to the in tank fuel pump or a bad fuel pump. If after switching the lines, it does run, then you need a new selector valve
time to clean out the system
you should probably try running reg diesel through the lines
so drain the fuel tank and put some reg diesel in rem the fule line recently replaced and allow it to pour our into a bucket then after the fule starts running there then hook line back up and start pumping it through the injector pump remove 1 of the cylinder lines and see if you have fuel there using a clear hose and a bucket
attach hose to end of fuel injector line and see if it is pushing fuel through the injector body
remem ber you are still pushing reg diesel
now that the system is clean and clear hook all lines up and try and start the truck up on reg diesel
if it runs then your off to the races
if there is no fuel check the fuel filter it may just be full of gunk
or the pump might be cooked
but rem line b4 filter and check for flow