Posted by Kevin (FL) on November 09, 2010 at 10:36:56 from (166.204.254.127):
Having some more fuel problems with our 95 6.5 diesel. Engine has 247k miles on it and it starts up and runs like the day we bought it. Always used Rotella 15-40 with oil changes at about 4500 miles. The first few years (when the vehicle was still under warranty) several injection pumps & lift pumps changed out by factory. I had to get a new pump about 15k miles ago. I clean out the filter housing once a year or so and change the fuel filter between 10 & 15 k miles. So here's what's happening:
Made a 3 hour road trip yesterday and with the tank about half empty, the engine started bucking pretty badly. Limped into a truck stop, filled up the tank and bled quite a bit of air out of the filter. I noticed the pressure on the lift pump was much lower than normal by the fact that the fuel barely flowed out of the vent. (I also confirmed the lift pump was running.) At the truck stop I went ahead & changed the fuel filter and reprimed the system and started up. Drove home last night and made a half-way stop and noticed the filter housing was not full. Bled more air and made it home OK.
As to the cause, I'm thinking either the stainless steel sock in-tank strainer is clogged or maybe the lift pump is getting weak? I have no way to measure fuel pressure off the lift pump but by observation I know the pressure is marginal in getting fuel through the filter. In the past, the electric lift pump either ran or it didn't and also, the fuel would flow at least an inch or two above vent when engine running and vent valve opened. This is the first time I seen it running but not delivering a good pressure. So I go back to the SS strainer being clogged....do you have any ideas as to what else could be causing the problem??
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