1800: What does this damaged capacitor do??

[142 Guy]

Originally Posted by ChasesDragons

Thank you for your description on doing to 3 port to 2 port conversion. All the capitals following are to highlight terns not to hout;

Do I understand the three ports on the pump form FUEL FROM TANK, FUEL TO INJECTORS, RETURN FROM INJECTORS?

When you say the 2 port conversion involves simply blocking the hose, do you mean the hose that is the RETURN FROM INJECTORS? Essentially changing the system into a "DEAD HEAD" system? Would this mean a different type of regulator used at beginning of the fuel rail and the rail is essentially into the dead end (head)?

Or am I misreading? is the return line from the injectors now being sent straight to the tank?

Two Qs arise if not; are the injectors going to get hot as the relatively stagnant fuel absorbs heat? Can it also increase vapour lock?

The more we talk, the larger this can of enquisitive worms seems to be! 👀🤣

You are not incorrect; but, there may be some details that require elaboration.

The three ports on the pump would be
1) suction - fuel from tank
2) outlet - fuel supply to the injectors
3) internal overpressure relief - connects back to the tank by different means as per the following discussion.

On the diagram that you posted, you can see that the 3rd line (fuel pump pressure relief) from the fuel pump tees into the fuel return line from the fuel pressure regulator. You cannot block off the fuel return line from the regulator to the tank. That would make it impossible for the regulator to control fuel pressure. However, if you are switching to a two port pump you can cap the tee that connected to the pressure relief port on the pump. Or it may be possible to completely remove the tee making for a continuous line from the fuel pressure return port back to the tank.

The diagram you posted may or may not be physically 'exact'. On my 142 E, the tee is actually a fitting mounted on the front edge of the tank with the line from the regulator connected on one side of the tee and the line from the fuel pump pressure relief port connected on the other side of the tee. In my case, switching to a 2 port pump just required putting an NPT cap on the side of the tee that went to the pump - hence my reference to blocking off the line to the tank which was probably confusing as hell for 1800 owners if the tee is located in the fuel line. As noted, I am definitely not a member of the 1800 Cognescenti.