Hello folks. I ran into a little problem on Wednesday. 01 Tahoe with the 5.3. Wouldn’t hardly run on my way to work that morning. It would start cutting out when I got on the throttle. Ran fine on the way home from work. Once I got home, turned it off, it wouldn’t crank back. Felt like a fuel problem to me. I was getting a little low on gas, but the light hadn’t come on yet and the gauge was reading probably 1/8 of a tank. So I put probably 1/4 of a gallon in it that I had left over from grass cutting season. Still wouldn’t crank, and the fuel pump seemed to be a little louder than normal. I could hear it running. Sprayed some crab cleaner in the breather tube and finally got it to crank. Took yesterday off from looking at it. Went out this morning, it fired right up.
Decided to see what the fuel pressure was running. About 40 psi but only when the fuel pump is running or the engine is running. The fuel pressure regulator has an adjustment screw, so I cranked the pressure up to about 62, which I read the psi is supposed to be 55 to 62. And it does seem to be cranking just fine now. Now to my question. Should that pressure remain constant? When the engine shuts off, or if the fuel pump ain’t running, I show no pressure on the fuel rail. Is that correct? I do plan on changing the fuel filter. I was just wondering if there was a check valve messing up somewhere, or if it is leaking back through the pump. Thanks in advance
Decided to see what the fuel pressure was running. About 40 psi but only when the fuel pump is running or the engine is running. The fuel pressure regulator has an adjustment screw, so I cranked the pressure up to about 62, which I read the psi is supposed to be 55 to 62. And it does seem to be cranking just fine now. Now to my question. Should that pressure remain constant? When the engine shuts off, or if the fuel pump ain’t running, I show no pressure on the fuel rail. Is that correct? I do plan on changing the fuel filter. I was just wondering if there was a check valve messing up somewhere, or if it is leaking back through the pump. Thanks in advance