Holley Electric Fuel Pump Over Heating

[Pro-Tour69]

Hello to Everyone,

I am at my wits end with a problem that I simply cannot figure out and I am hoping someone can help. Here are the particulars.

- 76 Kindsvater
- ZZ502 stock motor
- Holley electric marine pump mounted on the right hand stringer just behind the motor
- Custom made aluminum tanks on each side underneath the deck
- Fuel outlet fitting is at the rear corner of each tank going into a y-block then plumbed into the fuel pump
- Each tank has its own vent
- Fuel pump is on its own separate circuit using the standard fuel pump relay kit from Summit/Jegs (recent upgrade)
- Fuel filter is a K&N type
- Fuel system is a dead head style
- Carb is the standard Holley 850 that came with the motor and fuel pressure is typical at 5.5-6.5
- Ignition system is MSD marine

The boat was restored back in the late 90's early 2000's and Brett Bayne actually did a restoration story in Hot Boat back in '03 and the boat ran great from then till about 5 years ago. Since then the fuel pump over heats and shuts down and obviously the motor stalls and I become stranded on the lake. I wait 20-30 minutes for it to cool down and she starts working again. The fuel pump circuit as originally wired was not setup on a separate relay circuit like it is now and when I first started to root cause the problem, the fuel pump circuit wires were melted so I thought awesome, this will fix the problem but it didn't. I have also replaced the fuel pump as well after redoing the fuel pump circuit but the problem did not get fixed.

I have checked both tank vents and no obstructions. the last thing left I am thinking to check is to pull the hose out of the tank and see if after sitting in fuel all those years at the bottom of the tank that maybe the tubing has weakened and when the pump sucks the fuel the tubing is actually compressing causing the pump to work that much harder to pull fuel.

Other than this last idea, I have no idea what else to check. This is where I need help.

Any suggestions would be greatly appreciated.

Thank you in advance,

Scott