- 116
- 118
- 43
- Location
- Los Angeles/CA
Hey folks,
I've been reading on this forum for a few years, and finally got my new-to-me M1009 a couple months back. Bought it just north of SLC Utah after wrecking my 82 K5 offroading, and road tripped it back to Los Angeles the next day. It did just fine for an old truck that had been neglected for awhile, but seems to have a fuel problem of some kind.
I was only getting 15mpg or so and it struggled big time on the hills. Running 65-70 on the flat is no problem, but even with the truck empty it couldn't maintain speeds over 45mph on any sustained uphill climb. Also at anything past 3/4 throttle the engine will start to miss while going up a hill, and anything over 1/2 throttle doesn't really make a difference in power. I realize the 6.2 and 3.08 gears are not a performance combo, but I would expect that the truck would be able to go up a hill empty without an issue...
I have since replaced the leaking lift pump and the fuel filter, and now there are no more leaks. But any throttle over 1/2 still does not make a difference in power, and I still cannot climb hills at speed. I am thinking the fuel tank sock might be plugged up, or the injector pump might be on the way out. I am familiar with GM square bodies but new to diesels, and would appreciate any advice to help narrow down what to repair next. The pump is big bucks to replace, and pulling the tank is a lot of work. I'm hoping there is something else simple I can try, but not sure what it would be.
Pic of my K5 family, left to right:
![20180706_152310.jpg 20180706_152310.jpg](https://www.steelsoldiers.com/data/attachments/507/507000-42776502656cc51779962ac91f30ac15.jpg)
I've been reading on this forum for a few years, and finally got my new-to-me M1009 a couple months back. Bought it just north of SLC Utah after wrecking my 82 K5 offroading, and road tripped it back to Los Angeles the next day. It did just fine for an old truck that had been neglected for awhile, but seems to have a fuel problem of some kind.
I was only getting 15mpg or so and it struggled big time on the hills. Running 65-70 on the flat is no problem, but even with the truck empty it couldn't maintain speeds over 45mph on any sustained uphill climb. Also at anything past 3/4 throttle the engine will start to miss while going up a hill, and anything over 1/2 throttle doesn't really make a difference in power. I realize the 6.2 and 3.08 gears are not a performance combo, but I would expect that the truck would be able to go up a hill empty without an issue...
I have since replaced the leaking lift pump and the fuel filter, and now there are no more leaks. But any throttle over 1/2 still does not make a difference in power, and I still cannot climb hills at speed. I am thinking the fuel tank sock might be plugged up, or the injector pump might be on the way out. I am familiar with GM square bodies but new to diesels, and would appreciate any advice to help narrow down what to repair next. The pump is big bucks to replace, and pulling the tank is a lot of work. I'm hoping there is something else simple I can try, but not sure what it would be.
Pic of my K5 family, left to right:
- 77 Jimmy; 350/TH400/NP203
- 86 M1009; 6.2/TH400/NP208
- 82 Blazer, now a parts truck
350/700r4/NP208. Air lockers in both axles, winch, lights, roof rack, HAM radio, and all the other off road toys
![20180706_152310.jpg 20180706_152310.jpg](https://www.steelsoldiers.com/data/attachments/507/507000-42776502656cc51779962ac91f30ac15.jpg)