Hi Gang
I have a buddy (no its true its not me) he has a Perkins 4-108 and he cannot get enough fuel to the injector pump with the lift pump he has installed, we had a squeeze bulb in line and squeezing it gets enough fuel and the motor runs great.
So the question is if we were to remove the lift pump and install an electric pump in line what size pump do we need, we have a guy tell us no more than 20psi!
Any ideas would be greatly appreciated.
Ed
Quote from: EdHouston on June 14, 2010, 12:44:14 PM
Hi Gang
I have a buddy (no its true its not me) he has a Perkins 4-108 and he cannot get enough fuel to the injector pump with the lift pump he has installed, we had a squeeze bulb in line and squeezing it gets enough fuel and the motor runs great.
So the question is if we were to remove the lift pump and install an electric pump in line what size pump do we need, we have a guy tell us no more than 20psi!
Any ideas would be greatly appreciated.
Ed
please cure the disease and not the symptom By all means the symptom is that the beast doesn't get enough food but the diseases is that his lift pump is not working properly. repair the lift pump which is original dimensioned by the westerbeke company.
No need to remove the mechinacal lift pump if you want to go electric. The check valves in the mechanical pump will allow fuel to pass right thru. I always install a automotive electric pump with a switch on all my boats as a back up. Fuel will also flow thru this pump when it is off. It's really handy to fill the fuel filter when changeing it so you dont have to bleed the system. Also eliminates having to hand pump the mechanical filter if you have to bleed. Install the electric pump as close to the fuel tank as possible as electric pumps perform better on the pressure side. As far as pressure it's not critical. Injecter pum,ps will run on gravity flow as long as there is no air or interuption.
Capt Sandy
Ok all I have a follow up to this one, he had some nylon hose from the lift pump to the injector pump I was concerned that the ID of this hose was too small and advised him to replace it with the factory steel pipe, after taking the nylon hose off today he found the olives had sqeezed the hose to nothing more than a pin hole so I think we now have a culprit for the fuel shortage. He will be fitting the steel pipe over the next day or so I will report the result.
Ed
Ed,you might want to go with copper tubing rather then steel.Alot easer to work with,flair the ends use flair fittings.Incommunacado came with copper supply and return lines.Hope that helps.Allen