I am having some dramas with my Merc 2001 115hp 4 stroke that im hoping somebody might be able to help with.
I repowered my Seafarer with this motor last year, it only had 220 hrs on it but had sat around unused for along time. It went started & ran fine but seemed to run out of fuel at WOT, this seamed to be cured after I ran some Wurth injector clearer in several tanks of fuel. On occasion it would turn over but not fire after not being used for a week or two. I would remove the fuse cover & check the fuses(all ok) then it would start & run fine? Last time I took it out it did this again but then started but when running up the river at around 4000rpm it would just cut out and stall. I would then restart it only to have this happen again a min or tow latter. it then started to starve for fuel & then cut out & wouldnt restart. I then checked fuses (ok) and for any fuel leaks(none found) I then checked for fuel flow out of the low pressure pump (ok) & then for pressure at the schrader valve at the top of the fuel rail, no pressure found. I then removed the connector at the high pressure fuel pump and tested for power with my mate turning it over, the was no power feed. I then cut the wires to the connector & connected up jump wires straight to the power & earth at the starter. the high pressure pump now ran & the engine started. it then ran great like this at 4000 to 4400rpm for about 20mins then it seemed to stave for fuel again but did not cut out, it would only manage around 6knots at WOT the remainding 10 mins back to the ramp. I let it cool down for a couple of hours & reconnected the original wiring. This is when I found it had power supply to the pump was there but no earth, if I bridge the earth out to the manifold the pump runs?
At this stage I am planning on removing the high pressure tank assy to clean it out & replace the high pressure pump? & may be replacing the relays. I bought the motors as a pair so I have one as spares if needed.
Has anybody else had this with this model Merc or the Yamaha of the same vintage?