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Engine cuts off in '04 R-Vision Condor-Chevy 8.1 liter Bobby/Patty 3-19-12  
We have a 04 R-Vision Condor with a Chevy 8.1 liter engine that cuts off when we're driving down the road at average speeds. It used to just cut off and we would slow down and my husband would finally get it cranked again. It would happen a few times and then be okay. On the last trip we took, we started out and got 2 hours away from home and it started acting really bad. It started mis-firing or something and then would cut off. This happened so many times on the freeway we just decided to turn around and come home. Just a couple of miles from our house, it cut off and would not start for several minutes on a stretch of road with no pull-off. We finally limped home and I said I wouldn't get in it again until it was fixed. My husband has added fuel cleaner additive/water separator to see if it was water in the gas tank. It didn't fix anything. Could it be the fuel filter? What do you think?
Re: Engine cuts off in '04 R-Vision Condor-Chevy 8.1 liter BUBBA THE BUS TECH 3-20-12  
You need to figure out if you have fuel pressure and spark.
Most GM chassis will not turn on the fuel pump with out spark.
So does it have spark when it acts up.
Does it have power from the fuel pump relay to the relay when it acts up.
Finally does it have fuel pressure.
These things will probably narow it down.
One of the common issues have been a bad camshaft or crank position sensor.
But I am betting on a bad fuel pump or fuel pump relay. You can probably swap the fuel pump and horn relay to test that or buy a new relay they are fairly cheap.
The fuel pump will require dropping the fuel tank and is considerably more expensive.
Good LUck
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