New 4911 & first start: Runs very rough

[fullsizeBlazer]

Hey,

I just wanted to ask you before I kill the engine or the Injection pump.

-I installed the pump as I read it in the manuals: marked the pump drive and removed the old IP & installed the brand new mechanical 4911.
-The gear drive is installed like it was on the old pump, worked very good this far.


Well as for the startup procedure:

- Primed the oil pump
- Drained the fuel system from all remaining air, everything brand new (lines and so on)
- It started very fast but very rough, it shakes and sounds like a jackhammer.
-I left it run for max 5 seconds because I didn't want to risk any damage.



What do you think? :confused: Still some air in the lines?

[JohnC]

Any chance you crossed a couple of injector lines?

[fullsizeBlazer]

Hello John,

no, I installed the lines with my shop manual and checked them several times.

Maybe it is some air in the system, I discovered a major leak at the newer style, 1997 fuel filter. The lower gasket is shot so I suppose that it just sucked in some air. I ordered a new gasket, should arrive next week. Hope it works then! :D

Hope I get my custom exhaust installed the next days, I have to make some pictures of the truck, think you'll love it! :cool: