Gas Confusion?!?!?

Jonlxa415 · December 30, 2008

Ok so i was sitting at the car wash waiting to go in and i turn on the ac i roll up the windows and its still in park and the gas gauge goes from the org. position in the middle to full and then down to empty and half way to 3/4 all of this in around three seconds it did this till i started moving (pressed on the gas) i turn off the ac and go home i sit in the driveway with no ac and nothing happens it stays in the org. position... halfway so this thing has me all messed up

BuckFeverZ · December 30, 2008

Its the sensor in tank going bad. VERY common in the 99-02 GM trucks. You will either have to drop the tank or remove the bed to replace the fuel sending unit. While you're in there, you might as well replace the fuel pump too. I had this happen in my '99 GMC but I lived with it because I didn't want to shell out the cash to fix it.

Jonlxa415 · December 30, 2008

damnit how much is the gas sensor for these trucks ...and a pump i think ill dop it and replace the sensor but idk about the pump

alwcurlz · December 30, 2008

damnit how much is the gas sensor for these trucks ...and a pump i think ill dop it and replace the sensor but idk about the pump

Check out my experience. Crazy Gas Gauge and Low Fuel light: Fixed It was about $26 off ebay for the sending unit parts.

BuckFeverZ · December 30, 2008

If you can do the work yourself it will be a lot cheaper. The dealer will probably charge upwards of $600 - $700.

alwcurlz · December 31, 2008

Here are some instructions I posted a short while back if you decide to drop the tank.

Well, when you are ready to remove the fuel tank, you'll need to brace the tank at the front and back or with a transmission lift or motorcycle hoist. First, you'll need to remove the filler hose. There is another smaller hose inside the hose you see which which goes further into the tank. It may take some doing to remove that hose as it is right behind the frame. Make sure you brush away blow away debris like dirt/dust so it does not fall into the tank inlet. Remove the two bolts that hold the straps in place , and remove the straps as well. The straps will come out by twisting them and pushing up into the mounting bracket on the truck. Next, lower the tank enough that you can get around the tank to remove the electrical connector to the fuel pump, and fuel inlet/outlet/vent lines. Be careful of the fuel and vent lines as they are plastic, thin and can kink. Mine kinked but, didn't hurt them bad enough to cause a problem like steel lines would. There are several clasps that hold the fuel lines against the tank that need to be removed before dropping the tank any further. Those fuel line and vent lines are quick connect/disconnect and come off fairly easily. Examine them and sqeeze the area appropriate to expand the little catches. One fuel line from the front will let gas run out for a bit so watch out to not be right in the face of it. Once everything is disconnected, you can simply lower the tank enough to move it away from the truck. And yes, that handle/strap on the tank is standard equipment for something, heheh. Dragging it back under the truck for installing. Before removing the fuel pump, if like mine, it was buried in Texas gravel road dust and I had to dig/brush/blow it out.

Jonlxa415 · December 31, 2008

thanks you sir that helped alot!!!

Jonlxa415 · December 31, 2008

would this be the correct piece of equipment i need?? http://cgi.ebay.com/ebaymotors/Parts-Acces...A1%7C240%3A1318

BuckFeverZ · December 31, 2008

That's the one.

Jonlxa415 · December 31, 2008

ok sold...Thank You Sir!!

Spurshot · January 1, 2009

My 2500 lost the fuel pump on the freeway near Palm Springs last year. I hadn't changed the filter in a long, long, time. My bad. When it quit, I had a filter in the truck and tools. I was pretty sure it was a fuel problem and slid under the truck and loosened the engine side of the filter first. No fuel! I loosened the tank side and a bunch of fuel came out. The filter was plugged solid. So, I changed the filter and crossed my fingers. Nothing! The pump was toast. I had it towed to a GMC dealer and they replaced the pump. It was right at $1000. I priced the pump and it was up around $700 or so at over-the-counter dealer prices.

The moral of the story is: REPLACE YOUR FILTER. REPLACE IT REGULARLY AT THE RECOMMENDED INTERVAL (30,000 MILES i THINK)

alwcurlz · January 1, 2009

My 2500 lost the fuel pump on the freeway near Palm Springs last year. I hadn't changed the filter in a long, long, time. My bad. When it quit, I had a filter in the truck and tools. I was pretty sure it was a fuel problem and slid under the truck and loosened the engine side of the filter first. No fuel! I loosened the tank side and a bunch of fuel came out. The filter was plugged solid. So, I changed the filter and crossed my fingers. Nothing! The pump was toast. I had it towed to a GMC dealer and they replaced the pump. It was right at $1000. I priced the pump and it was up around $700 or so at over-the-counter dealer prices.

The moral of the story is: REPLACE YOUR FILTER. REPLACE IT REGULARLY AT THE RECOMMENDED INTERVAL (30,000 MILES i THINK)

Wow, good advice!