Fuel Pump Problems

[Dave_T]

I have a 1988 Evinrude 150hp. (E150TXCCA)
Recently my fuel pump went out. Instead of buying a new one for $400. I spent about $100 on two electric inline fuel pumps and connected them in series, followed by an adjustable fuel pressure regulator. The fuel pumps are rated for a carburetor (5psi - 9 psi). With one pump, it wasn't getting enough fuel, so I bought a second. The fuel pressure regulator goes from 0 (most restriction) to 6 (least restriction). In my driveway with ear muffs, it would run on 3 from idle to wide open fine. In the water, when I gave it some throttle it wouldn't do much at 3 until I turned it up to 6. Even at 6, it was very choppy and would only go about 3/4 of it's top speed. I know I should have spent the money and bought a stock fuel pump but funds are tight.

Is there anyway that I could make the electric fuel pumps work? Would it be better if I conected them in parallel? If not is there anywhere I can find a remanufactured unit or an off brand?

Thank You,
Dave

 

[ScottinAZ]

Re: Fuel Pump Problems

I would connect them in paralell, that should theoretically double your fuel flow to the motor. Connection in series, I cannot see that there is a benefit there, unless you have a large distance from the tank to the motor, and have suction problems. Seems as though the motor is starving for fuel, given that you have to open the regulator that far. Given that the pumps are rated for carb use, I would also try it without the regulator in place. That may also be giving too much of a restriction to the carbs. If the needle and seat are in good shape, then you should not have an issue with flooding.

 

[countvlad]

Re: Fuel Pump Problems

I have a 1988 Evinrude 150hp. (E150TXCCA)
Recently my fuel pump went out. Instead of buying a new one for $400. I spent about $100 on two electric inline fuel pumps and connected them in series, followed by an adjustable fuel pressure regulator. The fuel pumps are rated for a carburetor (5psi - 9 psi). With one pump, it wasn't getting enough fuel, so I bought a second. The fuel pressure regulator goes from 0 (most restriction) to 6 (least restriction). In my driveway with ear muffs, it would run on 3 from idle to wide open fine. In the water, when I gave it some throttle it wouldn't do much at 3 until I turned it up to 6. Even at 6, it was very choppy and would only go about 3/4 of it's top speed. I know I should have spent the money and bought a stock fuel pump but funds are tight.

Is there anyway that I could make the electric fuel pumps work? Would it be better if I conected them in parallel? If not is there anywhere I can find a remanufactured unit or an off brand?

Thank You,
Dave

if im not mstaken the max pressure out of a mechanical fuel pump is 2psi @ WOT ... i think your problem is the regulator... remove it and try with one pump.. if that doesnt work hook the second pump... good luck

and btw NEVER NEVER run a motor WOT on muffs...

B reak
O ut
A nother
T housand