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Old July 11th, 2011, 09:38 PM   #1
hobbyjeep
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'97 Diesel Fuel Sock (strainer)

I have a '97 GMC w/6.5L diesel with 185,000 miles. Engine was stalling due to low fuel supply to the injection pump. After I replaced the fuel lift pump, discovered fuel still not getting to filter canister. Pump checked and was working. I blew air back to the tank from the lift pump... now lots of fuel at filter canister.

Rather than pulling tank, thinking of putting an in-line filter in fuel line to trap any trash that gets sucked up due to fuel sock (strainer) being blown off the fuel pick up tube.

Question - what filter do your recommend be installed on the fuel line?
Question - should it be installed before the lift pump (suction side) or after the lift pump (pressure side)... and why?

Thanks/
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Old July 12th, 2011, 06:39 AM   #2
RADRICK
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You might want to consider dropping the tank. It's pretty common for the pickup in the tank to get clogged with metal shavings from the lift/inj. pumps on the 6.5l. Usually the lift pump starts to self destruct filling the system with metal shaving which can wipe out the inj. pump. Hopefully you caught it in time. At the dealership wher I used to work at we would pull the filter check for metal contamination, drop the tank, flush tank and lines. If it were me i would drop the tank and check it for metal, clean as needed, replace the filters- and hope for the best sice you already replaced the lift pump.
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Old July 12th, 2011, 10:41 AM   #3
hobbyjeep
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Good info. No metal in filter so far, maybe as a short term insurance I will attach a magnet to the side of the fuel tank or fuel line. Plus, maybe the magnet will aling the fuel molcules and I will get better mileage (saw this in a magazine once).
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Old July 13th, 2011, 12:59 PM   #4
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I just had to replace the sender assembly on my 94, the lines out of it had corroded so badly that I was pulling air into the fuel system and causing stalling. It was about a hundred bucks, and took me about 2 hours to R/I. Cheap insurance, and not too hard to do in nice weather.
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Old July 15th, 2011, 05:35 PM   #5
hobbyjeep
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didn't put another filter in line, just took truck over to radiator shop and had them pull the tank. They said the strainer was still on the pick up tube, but there was a lot of dirt and junk in the tank, but no metal shavings. So, cleaned the tank, new strainer and reinstalled. Even got my removed fuel back. Total $260.00... not stuck along side the road... priceless.
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Old July 15th, 2011, 06:36 PM   #6
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I was going to suggest running some bio guard fuel treatment. when I see system problems like yours its usually a build up of bacteria growing in the tank. it plugs the sock and then makes it run like crap. acts just like a plugged filter or bad pump.
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Old July 19th, 2011, 06:05 AM   #7
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Good to hear you got off cheap and lucky!
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