body, on the fraont of the pumpl is a right angle brasssss fitting which is fuell retaurn line to the tank,, its on the squaare cover of the top of the pump,, under the right angle is the paressure regulator valveeee and check valve, it iss an 1/8 glass ball, if u can blow thru it in any direction with your moutha,, then it is not capable of holding thissss five to seven,,,, if you pull this fuel returna line and turn the engine ,does fule comeee from the hole,, ok, nesxt,, on the fuel inline,,,, delivered,, there is aan electriaclall solenoidd in the cover, just under the vcoverr,, does it open when the elcedtrical ign circauit is energized,,, when u pulll the cover, does it have anayting looks like pepperrr inside the pump, andy at all is sign of failure,,,,,, thisi is the train,, is fuel gettinnnng to the injeaction pump,,,, is it getting tharu the solenoid,, is the frelif valvee holding the pressure,, 5 to seven, is the pump trashy inside, is the filater plugged, it may very wellllbee the sock strainer onn the pickkup inside the tank,,, they were notoraious for plugging with straight diesel, the nylon sock swelled shut,,, p replace the sock if it is bad with fine mesh staianless soldered screen, if u email me i will send u a fault tree, logic tree to use for tracking possibleeeeee proablems,buck,

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