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fuel questions/towing

G

gulfyankee

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Location
Jasper, TX
1995 CC DRW NV4500 3.42 rear.....

Am averaging 16 mpg +/- not towing, 7.8 towing a 38' TT(10,000 lbs) at 65-70. Just pulled it about 300 miles, and have a coating of soot on my rear bumper by the exhaust. Average boost while towing 8 lbs, maxed out is 12-13 lbs with the vacuum system hooked up, so it should be getting plenty of air. Powerwise it seems to be ok, of course I would like a bit more! But my question is, should it be smoking so much as to leave the soot coating on the bumper? Is it time for new injectors?
 
Sure would be where I would look into. How many miles if known on them? How many on the truck?

I often wonder why people don't include mileage on the sigs.
 
sorry, good point. the engine hasw 140,000 miles on it. AFAIK the injectors and IP have the same. I know when i first bought the truck the engine came from, I was getting 17 empty and 10 towing, over the last year it had dropped to 14 empty and 8 towing. Gained 2 mpg empty going to the 3.42's.
 
OK I can get them from Rock Auto for $328 shipped. I'll try to get them in a couple of weeks. Sure would like to see 20mpg!
 
Towing and hard work my injectors were done at 124K when I bought the truck. You should feel the difference.

Change the glow plugs while you are there.
 
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