I have a Universal M4-30 diesel. I expect there are different types of booster pumps but if it's like mine, it's a booster pump, not a feed pump. If the pump is ticking like a time bomb, it's trying to pump. Mine has one 12VDC power wire and the mounting foot needs to be grounded to Negative, so it's pretty hard to reverse polarity. We lost the pump during the trip home and found we could run the engine at half throttle without it and limp into a marina for repairs. Our problem was a dirty/loose ground connection and the pump worked fine for the rest of the trip. I replaced it with a pump from NAPA that was built for a Nissan pickup truck, but had all the right parameters for about $100. Our system has a return hose so whatever excess fuel isn't used by the injectors is returned to the tank. This makes it possible to remove the return line at the tank and put it in a jerry can or a large jar and run the pump with the engine off you can watch the flow. If you see bubbles, run it until it is full fuel flowing without bubbles. If you keep getting bubbles, you have an air leak somewhere between the tank and the pump. Check your hose connections and if you see cracks in the rubber, replace the hoses.
BTW, I used the same pump empty my fuel tank once when I needed to replace the tank. I was on the hard, so extended the return line thru a thruhull into jerry cans on the ground under my boat. It took a while to fill three five gallon jerry cans which I gave to a friend for heating oil. I bought fresh fuel for my new tank, and new hoses. Chuck Scheaffer, Resolute 1989 C&C 34R, Pasadena Md > On 09/11/2020 1:11 AM Ronald B. Frerker via CnC-List > <cnc-list@cnc-list.com> wrote: > > > Well, I did yoga for a month, waited for a day under 90F and finally > worked up the nerve to replace my fuel pump with a spare I've carried for the > last 15-20yrs. The bending and contourtions were painful, but the job was > accomplished. > Unfortunately, when I turned the power on, I heard the vibration of the > pump, but it pumped no fuel. The tank is full and the flow valve is open. I > have no filter between the tank and the pump. > So two questions: > 1. Could the pump have deteriorated during the period I was holding it > in reserve? > 2. Is there more to the install that I"m not aware of? I thought the > pumps were self priming, so that shouldn't be the problem. > My manual only shows the diagram without any instructions so I presumed > it was straight forward. > Ron > Wild Cheri > C&C 30-1 > STL > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > >
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