I was driving my 95 F250 and it started to run like the engine was being turned off and back on 3 to 4 times a second until it finally died about 30 seconds after the initial onset of the problem after which I coasted to a stop. I switched tanks in the process of the engine dying. 1 was full and the other was 3/4 full. Checking under the hood, I had plenty of fuel coming out water separator drain and did not see anything obviously wrong. I cranked engine 2X's and it did not start. Tach was indicating 200-300 RPM the entire time. 5 minutes later it started and ran great for another 4 miles on the other tank and the same thing happened again. I changed the fuel filter this time and it was fairly clean. Engine started up and ran another 2 miles before it died again. I sat 5 minutes before engine would start again and the tach still indicating the entire time when engine would not start. It did not make any difference on either fuel tank I was running on. I nursed the truck home and had it looked at the next day at the local PSD truck shop and they checked for trouble codes and I was told that they found 2 cam position sensor codes stored in the memory. A new CPS was installed and so far everything seems to be fine running on both fuel tanks, but my mystery question is if the CPS was ill, why would the tach still indicate RPM and the engine not start for a few minutes? It never went to zero until the engine stopped turning.
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