Just a recommendation! Yesterday my truck started to run bad and had a knock like I was fixin to throw some rods! I was WTF? In the middle of Nowherestonburgship NE. with a load. Being the dumb southerner that I am I started changing fuel filters. Only 5000 mi on them, why? I started with the nicktane! No change, still ran bad. OK, moving on to main filter, I just happened to have the key on (motor off) so the lift pump would supply fuel to the system. Fuel was pouring out of the drain in the WIF sensor! It was closed tight, I haven't used it recently. I was in a hurry, so I changed that filter and installed the new WIF sensor, it sits in my tool box for now, so I haven't given it the once over yet as to why. The moral of the story? I had just purchased a new WIF sensor from Eric @ Merchant Auto not 2 weeks ago because of broken wires on the OEM unit. This is something we all need to carry an extra one of ! I'll be reordering soon. Not to knock NE. but I would probably still be there if I didn't have the spare!

Whats a new WIF sensor cost?

Merchant Automotive has them for $45, I believe it's double that at a dealer!

FWIW, when I replaced my fuel filter, I found the filter drain plug on the WIF sensor to be cross-threaded. Since no one had touched this since day #1 of ownership, I can only assume it was cross-threaded at the factory. It didn't leak as it was super tight. I wasn't at all impressed with the material selection ... plastic ... for this particular application. Just another cheap solution for GM and a headache for us!

What's a WIF sensor and why do I need a spare?



Gar

What's a WIF sensor and why do I need a spare?



Gar

It is a small sensor that turns on when it detects water in the fuel filter. If a measureable amount of water is found in the filter it brings up a message on the DIC. It mounts in the bottom of the fuel filter and uses a float to detect the water. Each time you replace your fuel filter, you have to remove it from the old one and put it in the new filter. Or, you buy a new one and swap back and forth. It also has a port that allows you to drain water out of the filter in the event you don't have a spare in the truck. But know, ANY water in an injection system is a bad thing.

10-4 with water in the system

Good idea. Nice Lahti, by the way.

I looked at the filter setup and read the info that was posted; this is a delicate assembly. I carry the sensor, a sensor wrench, a filter, and a strap wrench (among other things). Got the sensor wrench from an eBay supplier for around $30 and the sensor from GMPartsDirect for around $35. That was about 8 months ago.

I inspected the WIF sensor today. Seems that the rubber O-ring on the drain screw failed for some reason. The last 1\4" screws in tight as it should to the seat, but I can still blow air through it! :eek: