| [GMCnet] Ethanol vs. Age [message #182482] |
Thu, 30 August 2012 20:14  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma:
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Senior Member |
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All:
I don't want to re-kindle the Ethanol debate, but I do need some help with a problem.
I'm going to run my GMC on an electric fuel pump. No mechanical backup.
So, I misplaced the mechanical pump block off. The young man who helped me with a lot of the work wanted to see the thing run, so we left the mechanical pump in place.
I replaced all of the fuel line, except the piece that went up to the mechanical pump.
Started. Run. Did the test drive. Then fuel delivery problems.
Pulled the filter tonight. Full of sticky black pieces of a rubber like material. The hose that I cut still looked OK.
FWIW, the tank lines are old (planned change for next year). New line from the selector valve to a filter, to the Holley Red electric pump, to new line to the metal that went under the engine, to the rubber to the mechanical pump, then metal up to the carb.
Replacement will have a few inches of rubber to a metal line to the carb, with the filters being the inlet in the carb, and after the selector valve. The back filter is clear, and looks just fine.
Insight? Do you think the material was the diaphragm from the mechanical fuel pump (which is most likely original, 87000 miles ago. Documentation bears this out).
Thanks for your help.
Dolph
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