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Matthew Brough
1998 Chevrolet Venture -- 104,000 miles
1988 Chevrolet Silverado -- 156,000 miles
1996 Chevrolet Cheyenne -- 107,000 miles
My 96 and 88 before the resto.
My 88 after the Restoration.
You should get 12 14 volts, battery voltage at the pump. Possibly a half volt drop through the wire resistance in that distance.
Check the wire to the frame for ground for a clean and tight contact.