hi i have a 1985 140 johnson.i am wondering if portable omc fuel tanks and 5/16 fuel hose is sufficent to fuel this engine.if i added an electric fuel pump would the vro still work proper.thanks for your help auto mec
The hose should be OK. Your motor is designed for fuel supply where the fuel pump on the motor makes a vaccum to move the fuel from the tank. Why would you want to fit an extra pump?
OMC recommends 3/8 hose.<br />Possible problems, cut and paste from previous thread,<br />It will work -- we do it all the time on race boats but there are a few things to understand. Wherever you put the pump the lines will be under pressure from that point on. Most fuel delivery systems are designed to have the fuel pulled thru them not pressured thru them. Any small fuel leak or weeping you may get becomes a stream.<br />Keep in mind that in an emergency if the cutoff switch is pulled the pump will contine to run. The Coast Guard and your insurance company frown on that.<br /><br />The electric fuel pumps on fuel injected motors are tied to some sort of back up shut off device like a float switch or tied into the oil pressure (4 cycle).<br /><br />If for some reason the pump blows fuel past the needle and seat you can pump a gallon of fuel out in a very short time. And in a very confined space. Ever seen a hood blow off in an explosion?
The electric pump is a bad idea, not needed, and bypasses the oil injector. If gas is forced thru the VRO, the pump does not cycle correctly, and thus does not deliver the correct amount of oil.
