Hi,

My older brother has a '91.5 w250, 4x4, auto, with 183,000 miles. About 3 weeks ago his serpentine belt split but never broke. Well after he replaced the serpentine belt the truck would not start. He then cracked all the injectors and a bunch of what appeared to be air bubbles were coming out of the fuel lines. Once the bubbles cleared out and after he tighten the injectors back down the truck started. Well now the truck's not wanting to fire up right away. It takes a few cranks to get the truck started. Until the serpentine belt issue the truck would fire up on the 1st crank. Now the truck also has a slight white smoke coming out of the exhaust shortly after start up and then goes away in a few minutes.

 

It's possible he knocked the wire of the KSB solenoid on the injection pump while working on the truck.

The KSB is a solenoid that advances the timing for cold starts. It's located on the left side of the injection pump which is on the the left side of the engine. The power wire is attached only by a spade connector and can come off if bumped. Don't confuse it with the fuel shut off solenoid located at the rear of the injection pump. Check that out.

And welcome to our little community.

 

Thanks for your imput. He's gunna try it once he gets home from work tonight.

 

He's got an air leak in the fuel supply system. Look for wetness above the fuel filter (fuel heater gasket) and around the lift pump, those are common trouble spots. If those look dry then the leak is most likely on the suction side and might be a little harder to spot. Lightly pressurize the fuel tank and watch for leaks from the supply lines and all connections.

 

That's what I thought too, wanna. I should have mentioned that also. I was just trying think of something that might have gone wrong during the belt going-bad and changing process.

 

My brother hasn't been able to work on the truck yet. He's been working long hours and can't get to it until this weekend. So I'll let you guys know this weekend when he thinks he'll get to it. Hopefully your ideas are the solution.

Thanks again !