Tech Support Forum - View Single Post - 1996 chevy s10 4.3L v6 loss power high rev

**mack1** · 05-07-2009, 10:31 PM

Hi foremanrider450 and welcome to TSF,

I suspect gas starvation at the higher rpms. Last time I had that problem, it was a fuel filter that was almost totally stopped up (by water). Would let enough volume pass for low speeds, but not enough for the higher speeds.

That engine used a single fuel line with electric pump external from the tank.
Not sure the filter on the circulating type systems will hold back water, but might be stopped up by debris.

There is a test for volume flow where you disconnect the line and see how much the pump will deliver at the engine in a given time. Sorry I don't remember the volume or time, but maybe someone will jump in and tell us both.

Another way to test would be to use a pressure gauge on the fuel line at the engine. The pressure (probably about 60 psi for your engine) should hold to near pressure at all rpms. A drop of 9 psi at high rpm is acceptable for normal operation.

Very best regards,
Mack1

edited: I forgot about the fuel pressure gauge method.

05-07-2009, 10:31 PM	#3 (permalink)
mack1 TSF Articles Team Join Date: Nov 2007 Location: Texarkana, Texas Posts: 1,245 OS: xp sp3 My System	Re: 1996 chevy s10 4.3L v6 loss power high rev Hi foremanrider450 and welcome to TSF, I suspect gas starvation at the higher rpms. Last time I had that problem, it was a fuel filter that was almost totally stopped up (by water). Would let enough volume pass for low speeds, but not enough for the higher speeds. That engine used a single fuel line with electric pump external from the tank. Not sure the filter on the circulating type systems will hold back water, but might be stopped up by debris. There is a test for volume flow where you disconnect the line and see how much the pump will deliver at the engine in a given time. Sorry I don't remember the volume or time, but maybe someone will jump in and tell us both. Another way to test would be to use a pressure gauge on the fuel line at the engine. The pressure (probably about 60 psi for your engine) should hold to near pressure at all rpms. A drop of 9 psi at high rpm is acceptable for normal operation. Very best regards, Mack1 edited: I forgot about the fuel pressure gauge method. __________________ "If you like yourself others will like you also" me "Don't drink downstream from the herd" Will Rogers Submit New Articles Here Last edited by mack1; 05-07-2009 at 10:38 PM.