Fuel Pressure for Boat Motor

[shannoninark]

Hello all. Thanks for all the previous help on this boat of mine...I have a 86 skeeter with a johnson 175 vro.. the vro has been taken off..my question is, how much fuel pressure should i be pumping to my motor.. i had a cheap pump on it when i bought the boat and at high rpms it was sucking it dry. i have replaced the inline pump with a holley high volumn pump that solved all the problems, but it floods it out now because it is pumping to much gas. so i have been to both extremes with this motor. no gas to to much gas. My question is there a cheap way to regulate your fuel pressure and what is the optimum fuel pressure for the motor. I really dont want to buy a 100.00 reg. Any help would be great..

 

[KennyKenCan]

Re: Fuel Pressure for Boat Motor

 

[jim dozier]

Re: Fuel Pressure for Boat Motor

Why didn't you just rebuild or replace the OEM fuel pump? I could be wrong but if you do a survey I bet you won't find many aftermarket fuel pumps on outboards.

 

[DJ]

Re: Fuel Pressure for Boat Motor

shannon,<br /><br />Electric pumps on outbaords are rare and in many cases deemed illegal and dangerous.<br /><br />In case of catostrophe, what shuts the fuel off?<br /><br />I believe that engine (non oil injection) had dual fuel pumps. I also believe the conversion from oil injection to pulse type pumps was quite easily done.

 

[shannoninark]

Re: Fuel Pressure for Boat Motor

It had a pulse fuel pump that could not keep up with the volume that the motor needed at high rpms. I took the pulse pump off and put a high volume impeller type pump. I can shut the pump off at the key. My main problem is regulating the fuel. The high volume pump pumps to much fuel and a regulator is 100.00. i was not aware that the motor had a factory fuel pump. i will call my mechanic and see how much they are. Any more answers would be appreciated

 

[DJ]

Re: Fuel Pressure for Boat Motor

shannon,<br /><br />I think what you may have overlooked in my post was that the V-6's (non oil injected) had DUAL fuel pumps. One cannot keep up.<br /><br />You say you CAN shut the electric one off, but what happens if the ignition is left on, you are incapacitated and there is a fire? It continues to pump.

 

[Hooty]

Re: Fuel Pressure for Boat Motor

2 1/2 - 6psi.<br /><br />c/6<br /><br />Hooty