Hello,

Looking at the Yanmar "Operation Manual", there is no mention of maintenance of the fuel pump, nor of any maintenance adjustment.

In the "Periodic Checking List" page of the Yanmar "Service Manual", there is no mention of maintenance of the fuel pump, nor of any maintenance adjustment.

However, in the Yanmar "Service Manual", there is a section called "Overhaul", and it says the fuel pump should be sent to a ZEXEL (the manufacturer of the pump) service center, and there are several pages of parameters and maintenance items for the fuel pump.

So, it seems the fuel pump is a maintenance-free item, except when you overhaul the engine.  Is this correct?  Is there any preventive maintenance for it, or is this a sort of a live and let die kind of component?

Thanks in advance,

Peregrinus

3,400 hours on 4JH3-HTE engine

Fethiye, ancient Telmessos, Asia Minor