Between Omaha and Des Moines, 7 miles South of I80 | That picture came from another NAT member (john jr, I believe) but it showed that cheap method of building a "fuel sight glass" for testing. (those hoses will turn discolored, after some years, so our dealership used a true glass-type sight glass, until we got to #10 size and then CAT sell a larger acrylic sight glass (so you can get the necessary volume, thru the sight glass, with engine under Full Power) Note: too small of a sight glass can mislead you when trouble-shooting. Yes, those GMC/Chevy Topkick plastic fuel lines were a typical problem, but we tended to see "rubbed and worn" plastic lines(start sucking air), under the cab area. I made up a parts list, and we changed everything over to #6 Aeroquip lines, from fuel tank to primary fuel filter, then from primary filter to engine. This even eliminated the yellow CAT steel lines, by the cam followers, also. = less connections, less restriction, easier to add in sight glasses, in-line, if necessary, in the future. No waiting for parts from GMC, either. I photocopied that parts list, about 20 times, and hung the copies up, for other mechanics to use; so they didn't have to figure out the part numbers and compression fitting adapters.(fit OEM suction pipe on fuel tank) We changed both supply and return lines (although return lines would tend to leak externally, and was a more rare failure, than the supply plastic lines)
Edited by 4WD 5/24/2020 12:20
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