1989 Suburban "V Rig" Gets Cummins Power

[Dieselwrencher]

It could also be the injection pump input shaft seal leaking which can put diesel into the crank case. If it were an injector, it would either smoke horribly, run rough, cough, and the exhaust would smell of diesel fuel bad. In the crankcase vent you can get condensation in the hose and that can make the end look milky. This is also caused by crankcase pressure, sort of aireration.

The mileage being down may be due to the 3:54's and 35's. But, if this is combined with towing, it's hard to say for sure. The auto may eat some of that too with the gears and tires. Mine is a manual and does better than yours, but while towing it does drop down.

[v-man]

Ok, research update. with concensus with my tree buddy-no diesel in the oil, and liquid coming from vent tube could be condensation, watery with no diesel smell. Most likely diesel leak is water/ fuel separator valve on fuel filter. right know the filter is a Napa 3379 and I'm assuming thats a stock valve on the bottom. The only aftermarket filters with built in valve are Napa 3472 gold, A wix 33472, and it looks like fleetgaurd make a similar one but not as easy as the other two. Would either of those other options be good or not.

On another note the V-Rig got a foot peddle mod. I noted about a 3/4 inch amount of play in pedal before throttle engaged. I placed a old split shot line sinker on the throttle cable at the foot feet end and now have no slop and it feels like a additional 60hp. I think this might have been part of my problem. I have so much carpet and pad that I think i was having trouble advancing the throttle. I'll wait for some hopeful responses before changing fuel filter

[v-man]

whoops