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The fuel line runs from the rear of the fuel throttle body down the rear of the engine to the frame, along the frame to the fuel tank. It might have a fuel filter along the way on the frame, If so you can easily disconnect the line from the filter and blow from that point, back to the fuel tank, and forward to the rear of the throttle body. Make sure and disconnect the line from the throttle body so you don't damage the injectors or jam some trash deeper into them. Plus be careful blowing pressure into the tank, the fuel pump is in the tank and might be damaged from the air pressure. Good luck.
Sounds like you need to replace your throttle body. Maybe just the seal on the base. Really no way to check other then replace, But if you do replace make sure they change the gaskets along with it. Good luck to you, You may get a good one from a salvage yard to test it out,
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
Could be fuelfilter or fule pump.or a fuel regulator.You may try taking fuel line loose at throttle body turn key to on and see how its pumping.The filter i believe runs cross ways in front of the gas tank.No need to take the plastic retainer loose to take it off
throttle body is located at intake manifold ..follow snorkle from air cleaner to where it attaches to motor ..looses hose and clean with carb cleaner there..open blades(throttle) to get behind entry good also..... fuel filter is located in tank and in line from fuel tank just in front of tank inline with fuel line...good luck