joeq
06-17-2013, 15:10
We all know most poor running diesel engine problems can be attributed to the fuel system somehow. (Relating to "BC"...before computers) Trouble is...where to look. To make a long story short, I want to share this so as to possibly help someone with a similar situation.
My truck began to show signs of an ailment a few weeks ago. (Random rough running and stalling). It's an 83 C-30 6.2, 4 spd, cab and chassis, dually, with 2 tanks. I haven't been too confident with my fuel gauge, so to make sure I wasn't running low, I added 10 gals to each tank. Whenever the truck became possessed, I would sometimes switch from the left to the right tank, hoping it was a fuel level problem. still the problem persisted. I did put a few "undocumented" miles on it, at that time. It got so bad, I needed to put in some serious troubleshooting time. Because it appeared my filters were full,(proving good lift pumps) and I did completely fill my left tank, I was adamant it was either clogged injectors, or worse, a bad inj. pump.
Rather than bore you with the step by step elimination process, it turned out to be a faulty fuel tank selector valve. Altho I thought I was operating off my full L/H tank...it wasn't.(Right tank was M/T) Why did my filters and pump show OK during my garage tests? Maybe cause it was on level ground, and there was just enuff to show so. (live and learn)
My truck began to show signs of an ailment a few weeks ago. (Random rough running and stalling). It's an 83 C-30 6.2, 4 spd, cab and chassis, dually, with 2 tanks. I haven't been too confident with my fuel gauge, so to make sure I wasn't running low, I added 10 gals to each tank. Whenever the truck became possessed, I would sometimes switch from the left to the right tank, hoping it was a fuel level problem. still the problem persisted. I did put a few "undocumented" miles on it, at that time. It got so bad, I needed to put in some serious troubleshooting time. Because it appeared my filters were full,(proving good lift pumps) and I did completely fill my left tank, I was adamant it was either clogged injectors, or worse, a bad inj. pump.
Rather than bore you with the step by step elimination process, it turned out to be a faulty fuel tank selector valve. Altho I thought I was operating off my full L/H tank...it wasn't.(Right tank was M/T) Why did my filters and pump show OK during my garage tests? Maybe cause it was on level ground, and there was just enuff to show so. (live and learn)