I have been driving my truck the last couple of week's at frist I was getting around 17 mpg's but it keeps getting worse now down to about 9 mpg's:(. Any ideas what could be going on

What are your pyro and boost gauges saying?

Check and see if you have any fuel pooled in the valley of the engine. I had one of the line nipples decide to crack on mine and you could almost watch the gauge drop.

Yep, sounds like a fuel leak somewhere, check your supply and return lines.

Check and see if you have any fuel pooled in the valley of the engine. I had one of the line nipples decide to crack on mine and you could almost watch the gauge drop.

Nipple on which part?

The IP see here for pic and saga.

http://www.dieselplace.com/forum/showthread.php?t=215912

with the price of fuel, make sure someone isn't siphoning it. Ed

Looked Today No Fuel Leaks. Pyro Between 400 &600 At 60 Mph Boost 1 Or 2 Lbs
Seems To Be Losing Power Also

with the price of fuel, make sure someone isn't siphoning it. Ed


Good idea Ed. Who know huh?

Check and see if you have any fuel pooled in the valley of the engine. I had one of the line nipples decide to crack on mine and you could almost watch the gauge drop.
Very possible, my line to the "T" valve is leaking now from rubbing the IP. Sad part is it's not that old.:(
Yep, sounds like a fuel leak somewhere, check your supply and return lines.
Check the lines as stated under the truck as well. Diesel will dry up pretty quickly so you will not see it in the morning if the leaks slows as it cools(on the ground, may stay in the valley longer).
with the price of fuel, make sure someone isn't siphoning it. Ed
I bought a locking cap for mine 3 years ago, just be sure to lube it up with WD-40 or something of that nature as it may sieze up in the colder weather.:mad:
Looked Today No Fuel Leaks. Pyro Between 400 &600 At 60 Mph Boost 1 Or 2 Lbs
Seems To Be Losing Power Also
Temps would depend, on my part at least(based on hilly or flat surface) and the boost seems kinda low to me. Just a thought.
Have you done a compression test?
Losing power can fall under many different issues so that may come at a later time, or may be solved with the loss of fuel issue.

Pyro 400 & 600 On Flat Ground . I Looked For Fuel Leak After My 35 Mile Drive Home From Work

Pyro 400 & 600 On Flat Ground . I Looked For Fuel Leak After My 35 Mile Drive Home From Work
What is your gearing and what were your RPM's and have they fluxuated since the issues you are having?
If these issues are recent, have you made any of your upgrades recently? How long have you had everything in your sig and has anything changed since you posted it?
Just fishing for anything that can help in a diagnosis.

This is a long shot and you guys will think I'm nuts but my lift pump wasn't working(broken wire) and the truck went from 17 to like 14. As soon as I fixed the lift pump MPG went right back to 17. I can't say if it lost power or not cause I usually drive pretty light footed but I do remember stomping it once to get on the hwy and it felt a little sick.

This is a long shot and you guys will think I'm nuts but my lift pump wasn't working(broken wire) and the truck went from 17 to like 14. As soon as I fixed the lift pump MPG went right back to 17. I can't say if it lost power or not cause I usually drive pretty light footed but I do remember stomping it once to get on the hwy and it felt a little sick.
Why would we think you were nuts? Everyone has had an issue that will cause different things for each and every situation out there. The more that will chime in on what may have happened to them, may help the next person that has a similar issue.
Thanks for the input aces.;)

Make sure your trans is going into Overdrive.

This is a long shot and you guys will think I'm nuts but my lift pump wasn't working(broken wire) and the truck went from 17 to like 14. As soon as I fixed the lift pump MPG went right back to 17. I can't say if it lost power or not cause I usually drive pretty light footed but I do remember stomping it once to get on the hwy and it felt a little sick.

I can see that making sense...IP is working hard to try and keep engine running.

The truck has 4.10 rear gear it running 2400 rpms at 60mph the trans seem to be shifting fine. I can hear the lift pump and seems to have good flow out of bleeder valve . No up grades for few mounth now

My truck also has 4.10 gears and used to run 2400 at 60mph but now it seems that my tranny has gave birth to another gear. It runs about 2150-2200 at 60mph. I get about 16mpg in mine. Not sure if that helps but maybe someone could tell me why i'm losing rpms??