New injector pump. Wont start

[Jerrydavis1224]

1970 m35a2 old injector pump was only putting fuel to the #6 injector and it was only a dribble of fuel. Not near enough to pop injector. I put a new pump on and its the exact same thing with new pump. In tank pump is good and putting plenty kf fuel to the boost pump on the side of the injector pump. Cleaned the housing and mount for the two post filters and changed them. Getting fuel throught them and back to the tank. Also all check valves and pressure valves are clean and working properly. I have a tried everything i can think if and i am stumped.

 

[rustystud]

When you installed the new pump, did you look at the drive gears on the engine ?

 

[Floridianson]

Just asking did you follow the TM on install? It does get a little confusing but not too hard. Did you recheck timing to start with?

 

[Welder1]

When you installed the new pump, did you look at the drive gears on the engine ?

Rusty,

If he installed the pump 180 degree's out of time do you think it would start? Not sure what else could have gone wrong here.



Eddie

 

[Jerrydavis1224]

When you installed the new pump, did you look at the drive gears on the engine ?

Yeah and everything is working fine and looks fine there

 

[Jerrydavis1224]

When you installed the new pump, did you look at the drive gears on the engine ?

Its got fuel to the injector pump and some times it will pump fuel fuel out of the hydraulic head and some times it wont. It’s almost like its air locked but ive done everything i can think of to get the air out of the system

 

[rustystud]

Rusty,

If he installed the pump 180 degree's out of time do you think it would start? Not sure what else could have gone wrong here.



Eddie

It would, but like any engine it would not be firing correctly on all cylinders.

 

[rustystud]

Its got fuel to the injector pump and some times it will pump fuel fuel out of the hydraulic head and some times it wont. It’s almost like its air locked but ive done everything i can think of to get the air out of the system

That was why I asked about the drive gears. Did you by chance loose the slotted piece the pump locked into ? If those pieces come loose and or fall out you would have the pump spinning only when a piece of the drive system came around and struck the pump drive.
Considering both of these pumps are acting the same way then something ahead of the system is causing the problem. Like the pump drive system.
You have made absolutely sure the fuel system is clear of obstructions and free flowing right ?
You did check out all the injection lines too ? All free and open ? You can remove them and just blow through them to be sure. I would use a air compressor and air nozzle to be totally sure myself.
If after all that everything still checks out, then it has to be the drive system.

 

[rustystud]

Just another note. This new injection pump was rebuilt correct ?

 

[Jerrydavis1224]

Just another note. This new injection pump was rebuilt correct ?

It is a NOS pump

 

[rustystud]

It is a NOS pump

OK then. It must be the drive system. Pull the pump out and check those gears and drive. Something must have come loose or is broken.

 

[Floridianson]

Rusty,

If he installed the pump 180 degree's out of time do you think it would start? Not sure what else could have gone wrong here.



Eddie

Yea I am hearing what you are typing and myself I would double check timing first. Plus there are two ways of checking TDC compression stroke.

 

[rustystud]

It would, but like any engine it would not be firing correctly on all cylinders.

Rusty,

If he installed the pump 180 degree's out of time do you think it would start? Not sure what else could have gone wrong here.



Eddie

Since the original pump was acting the same way the new pump is, I'm pretty sure timing has nothing to do with it. Unless of course the original pump had been removed and replaced.