M1009 NEW INJECTOR PUMP SMOKING

[wreini]

Hello, I just put on a new rebuilt injector pump because of a hard hot start issue I was having. New pump went in no problem, I aligned the timing marks to the timing cover. and it started right up and idled great. the problem I'm having is that it spits out a ton of black smoke now when I floor it. not just a puff. more like a quarter mile long haze. has pretty good response and it will even speed on the highway now. Smoke goes away once I make it up to speed. only appears under load. It did not smoke at all with the old pump.

I've tried to correct it by advancing the timing about 1/8th of an inch past the mark and several increments in between. It seemed to help a bit. but without putting some weight into it it wont go any further and I don't want to cause another problem by going too far. I've also turned down the fuel screw in the pump about 1/8 of a turn.
I have an electric lift pump installed, all fuel filters and air filter are new. I'm hoping someone can point me in a direction and I'm just having a moment. I'm supposed to drive it out to Colorado next week for a camping trip. All I've done to test timing is push in the advance. it will slow down a bit but doesn't stumble like i've read online.

Thanks,

 

[NDT]

I believe the injection pump rebuilder might have set the fuel rate wrong, not a timing issue.

 

[wreini]

Is there any rule of thumb about fully seating that screw and turn it back 2 turns like on a carburettor? I can keep backing it off 1/4 turns at a time but it’s time consuming if there’s a better way without having a test stand.

 

[Barrman]

You want to tighten the screw to reduce the fuel rate.

Is it a 6.2 pump or a 6.5 pump? 829 is a 6.2 pump and 831 on the data plate is a 6.5 pump.

 

[wreini]

Db2 4544 but every thing I have read/watched says tightening that will straighten out the leaf spring in the pump and give you more fuel. But also looking at that, if it seats on a spring there is no way to bottom it out.

 

[antennaclimber]

I set the timing on my recently rebuilt 6.2 engine just last night. Aligned the timing mark on the IP with the one on the engine.

Lots of smoke and not running correctly. As with my other 6.2's that received a new IP, I rotated the IP toward the passenger side, made it much worse.
Finally after several adjustments, the IP timing mark ended up about 3/16" on the drivers side of the engine timing mark. None of the other trucks I own have them to the drivers side. I never expected that it would be that far off toward the drivers side.

Positive side effect from testing in the garage, I am now immune to Carbon Monoxide...