water in fuel

Still no progress, parts ordered, will be overnighted when available. Talked with service manager today, no luck at all. Having him get GM rep. call me maybe tomorrow. I still feel GM should be responsible for this since water in fuel light never came on. Still can't see how all of this has gone bad and I drove it to dealership. What really makes me mad now is I need truck this weekend to tow my race car, told service manager that he said he can't help me but could get me a loaner car. I don't need one I have a car to drive during the week all I need is something for the weekend to tow. :mad:

DMAX is right. The old happy-run-around. :( On my old 95 Sub, the WIF light came on, and I had no more than a half-teaspoon in the bottom of my filter. The DM should work just as well. Give em heck!
Good luck.
DW

Unless I missed the post... what's the inside of the fuel tank look like?

Jim

Parts are in, should be ready Tuesday.

I have another story, Talked to local guy with roofing company who had duramax truck do what mine did he took it to a different dealer than me. Rust and water in filter but he kept fuel from tanks that they drained and found nothing in it but this fixed the truck, water in fuel light never came on either. Truck has 18,000 miles on it. He has his own pumps at his shop and had fuel supplier come and check tanks, found nothing wrong. He has 2 more duramax trucks checked them and they had started to rust in filter. Also he had just recently switched to low sulfur fuel about 3 weeks before this hapened. He checked his ford and dodge trucks filters and no rust found, he has about 20 diesel trucks. Now you tell me what it is. :confused:

Just got truck back this evening, so far so good. GM rep. is still supposed to contact me. I'll probavly check fuel filter after 4,000 miles or maybe sooner.

I didn't check back through all the other replys to see if this has already been mentioned, but here's something. The Mar/Apr issue of 8 Lug Diesel Truck mag has an article (P80) on the D-Max fuel filter R&R. Their WIF light didn't come on, either. Their WIF sensor was clogged full of water and rust! The little float in the bottom was seized up with rust. Couldn't send a signal if it wanted to. Sounds like that might have been the case with your truck.
Hope this isn't redundant info, and that it helps
DW

Truck is fine except for one thing, there is a slight vibration i can feel coming through the brake pedal almost like a tingling feeling when i'm stopped, weather its in park or in gear. Going to have them check it out monday. Hopefully its something minor and they find it easily.

:D

I've had a couple of these "water in fuel" issues. The first thing that I do as a technician is check DTC's. Experience has shown that the knock usually comes along with a misfire dtc. I always check the fuel filter and air filter. Then, I remove the fuel filter and dump it out into a clean pan! Now I agree that the WIF sensor should have turned on, but only if the water is NOT SUSPENDED (in the fuel)!! Most of the time when these trucks come in with the knock and fuel contamination the fuel in the filter is very cloudy and there isn't enough water in the filter to actually float the switch!

Now the unfortunate part is that after flushing the fuel system and adding fresh fuel along with some STANADYNE to the tank, there may be an injector or two that may need to be replaced.:cool: