Quote:
Originally Posted by Hart_Rod
Correct, that is a better way of doing it. Just make sure the original relay is good.
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That Metripak relay was used by GM up through at least 2005 ish (probably later) for lots of different things on lots of their cars, vans, and trucks.
O'Riley stocks them for cheap.
Quote:
Originally Posted by Hart_Rod
Hatzie do you forsee any issues with the original tank wiring/setup handling the high amperage draw of the higher PSI pumps?
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Electric fuel pumps draw about 5-8amps at 14.5vdc and a tiny bit more at 13.5vdc. The newer more efficient LS pumps aren't going to draw significantly more than the original old inefficient TBI pumps from the late 1980's.
The wiring diagrams state the GM wiring is 0.8mm˛ (18AWG)
The PCM controlled AD series alternators on the LS motors don't typically idle state charge at much more than 13vdc. They can climb to 14.5v if the PCM detects higher current draw but typically you'll see them run 13vdc out.
18ga stranded copper automotive wire will carry 18amps at 13vdc and a little more at 14.5vdc. That's a pretty healthy safety margin.