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When our Tahoe would not start after a couple of years of faithful service, a mechanic "friend" told us to never let the fuel tank go below 1/4 of a tank. We followed this advice and have never had a problem. Yet, on a road trip last weekend, it stalled out--simply quietly died without warning while showing a little less than 1/2 a tank of gas. (We knew this to be pretty accurate, too) Luckily, we were able to pull over and after a few minutes, it started --went a couple of miles, stalled and stopped, then re-started and ran fine. My husband did add a couple more gallons --just in case--when we made it safely home. We asked the GMC dealer about this problem and he told us we probably needed a new motor in the tank and that would entail removing the tank--and quite an expense he said. I have looked at the GM site for similar problems and recalls. We do regular maintenance and have never had any problem other than this one with the fuel tank!

Please have the fuel system tested out to insure what the problem is. It is common for fuel pumps to die at 100k. If you will go to my website www.masterautotech.com and click on "tech training" you will see the all the tests needed to determine if the fuel pump is faulty. The wave pattern test is most important to catch an intermittently “bad” fuel pump. At my shop we perform this test on every car that comes into my shop as preventive maintenance. Just make sure the shop you choose has a lab scope with a low amp inductive probe. If they don't have the right equipment, find a shop that does! If the truck dies before you get a chance to have it looked at, try this trick. Have some one crank your truck while you "bang" on the bottom of the fuel tank with a shoe. If it does start, then you have a fuel pump problem. Have your repair shop check for a voltage drop to and from the fuel pump. Most fuel pumps now come with new connections that have to be "hard wired" into the harness in order to stop the voltage drop problem. Good shops aren't expensive, they are priceless!

 

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