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The feed pump, often called a lift pump, is the heart of your engine's low-pressure fuel circuit. Its role is to draw fuel from the tank and deliver it to the injection pump. DAM Marine offers genuine Yanmar and high-quality replacement feed pumps, as well as repair kits, to help ensure the reliability of your fuel system.
Confusing these two pumps during diagnosis is very common. Yet their function and cost have nothing in common:
The mechanic's tip: a faulty feed pump creates symptoms that look like an injection problem. Always check the low-pressure circuit before blaming, and paying for, an injection pump.
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12 volt electric diesel fuel feed pump for Yanmar engine.
T-connector.
12 volt electric diesel fuel feed pump for Yanmar engine.
Parallel connection, not T-connection.
Diesel pump for Yanmar 2GM - 3GM - 3HM series engines.
Diesel feed pump for Yanmar engine.
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Diesel feed pump for Yanmar engine.
Diesel feed pump for Yanmar engine:
- 2QM15
- YSM8
- YSM12
Loosen the bleed screw located after the pump and operate the manual priming lever. The diesel fuel should come out in strong, clear spurts. If the flow is weak or irregular even though the filter is clean, the fuel lift pump is probably at fault. Keep an absorbent cloth nearby to catch any splashes.
It can be used as a temporary solution, but caution is required: the delivery pressure of a standard electric pump is not always suitable. Excessive pressure at the injection pump inlet can disrupt its operation. It is therefore preferable to use the genuine Yanmar mechanical part designed to provide the correct pressure.
The repair kit, including diaphragm, valves and seals, is ideal and economical if the pump body and its metal lever are in perfect condition.
A complete new pump is required if there is play at the lever pivot. Mechanical wear reduces the pumping stroke: even with a new diaphragm, flow will no longer be sufficient. Heavy external corrosion is also a reason to replace the complete pump.
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