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I have a 755 that was running just fine when I parked it went out the next day and it wouldn't start. Put new glow plugs in it along with module, still no start, had injection pump rebuilt still nuttn. It acts like it wants to start but never takes off. Not sure what direction to go, maybe compression test? Tried starting fluid but that does nothing. Any help would be great.
 

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Man, has the soundings of fuel gelling up. Not really enough information on temps and everything. Crack the fuel line to one of the injectors and roll it over and see if you're getting fuel to the injector.
 

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Loosen your fuel tank cap while your at it. Probably not the problem, but go ahead and eliminate it while your at it.
 

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“Acting like it wants to start but doesn’t take off..” either starving for fuel, or the unlikely possibility the cam jumped timing and the valves aren’t opening and closing at the right time?

Might need to a compression test to be sure. Also, you DID bleed the fuel system... right?
 

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Replacing parts isn't a guarantee that the particular system is working.

Check fuel delivery from the fuel tank, lines, through the filter and to the fuel pump inlet & outlet. Bleed the pump and injectors. If fuel is present at the injectors you may have a glow plug / pre-heater circuit or compression problem.
 

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If its not firing on a whiff of ether, something else is wrong. Crank speed, compression, timing?
 
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Another thing to check for, make sure all hydraulic functions are in neutral. Push the three point lever forward and if you have scv lever, be sure lever is in neutral and not sticking. If you have power beyond, make sure those hose connections are plugged in properly. The hydraulic pump in relief can prevent engine from starting. Engine does not produce enough power at cranking speed to overcome 2500 psi relief pressure.
 
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