Electric fuel pump issue.
Posted: Thu Aug 16, 2018 11:30 pm
Folks,
I'm at a standstill. The starboard engine on my boat has been plagued with fuel issues:
- water allowed to get into the gas tank. That's been rectified - pumped tank out of all old gas and crud. Old gas to someone who owns a shop and uses it for parts cleaning.
- carburetor issues - corroded. replaced with rebuilt Rochester Quadrajet.
- Fuel pump issues - old mechanical pump failed. Replaced with electrical one (CG approved) from NAPA. Therein lies my current problem. See the attached schematic / steps listing. The problem is that the engine will start and run - as long as the momentary switch (which completes the ground circuit to the pump is held in place. If it's released AND the Jumper between TS2 and 3 is NOT in place, the pump doesn't run (which would be logical as that jumper's intent is to complete the ground circuit thru the relay and oil pressure switch.
What's driving me nuts is the fact that, with the Jumper in place, the engine NOT running (or being cranked), the pump IS running (ie, somehow the ground circuit is completed.) Obviously, I can't allow this condition to exist - need the pump to activate only with engine running (and not using the momentary switch).
Anyone have any ideas???? I've traced all wires and they go exactly as indicated in the drawing.
Bill
I'm at a standstill. The starboard engine on my boat has been plagued with fuel issues:
- water allowed to get into the gas tank. That's been rectified - pumped tank out of all old gas and crud. Old gas to someone who owns a shop and uses it for parts cleaning.
- carburetor issues - corroded. replaced with rebuilt Rochester Quadrajet.
- Fuel pump issues - old mechanical pump failed. Replaced with electrical one (CG approved) from NAPA. Therein lies my current problem. See the attached schematic / steps listing. The problem is that the engine will start and run - as long as the momentary switch (which completes the ground circuit to the pump is held in place. If it's released AND the Jumper between TS2 and 3 is NOT in place, the pump doesn't run (which would be logical as that jumper's intent is to complete the ground circuit thru the relay and oil pressure switch.
What's driving me nuts is the fact that, with the Jumper in place, the engine NOT running (or being cranked), the pump IS running (ie, somehow the ground circuit is completed.) Obviously, I can't allow this condition to exist - need the pump to activate only with engine running (and not using the momentary switch).
Anyone have any ideas???? I've traced all wires and they go exactly as indicated in the drawing.
Bill