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OK. The fuel pump is rated with no air in the system running at 1800 rpm pump speed (not detroit spec, my rule of thumb) The way to easily check the pump is on a running engine and check the pressure at 1800 to 2000. I think it's suposed to be 70 psi. Does the engine run on starting fluid, or if you are cautious try to start? If it does the air intake system is ok to start it. The unit should run on your primer system. If it won't You are looking for computor/injection problems. The easiest way to prime the fuel system is to find the schrader valve (tire valve) on the primary or secondary fuel filter base. Pump fuel into this valve At less than 70 psi but more than 30. Diesel shops have a pump special set up for this. If you are as cheap as me undo the fuel feed line to the primary filter and hook a hand pump to the inlet line and pump from a jerry can until fuel fills the system. I usualy take a plug out of the secondary filter base and pump until the fuel starts coming out then put the plug in and continue pumping for the same amount of time or until the jerry can is empty. Then reconect the fuel line. Remember we have air between the tank and the filter still so when the engine starts it will need to go instantly to high rpm (1500 +) for at least 3 minutes to purge the air from the system. This system will only self prime at high rpm. Like 1500. This a pain if it won't start so we have to prime it. Though I was broke down one time and had my bus towed to a steep long hill that happend to be a block away from where I ran out and got it running that way. I hope this will help, Good Luck |
RV and bus conversion info since 1996.
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