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my 2002 2.6 liter is giveing me warm starting problems.
i have adjusted the tps sensor all over the place and have
noticed no change. keeping in the .48-.52 range. i have noticed
after a trip to the lake that the clear bowl is only about
5/8 full? i assume this is a water seperator? motor starts great cold
and fine after shut off but have to give it a little throttle after a 15min -to 1 hour wait. any ideas or what to look for??
I have a 3.1 250ox66 and having similar problem. I rebuilt my fuel pumps (which was an idea from another yamaha buddy here on bbc) and solved my problem. hope this helps.
i have no leaks but they still could be bad?
i would check the fuel pumps also, mine did the same thing i replaced the fuel pumps and all is good
can you buy a rebuild kit or all new pumps??
obviously the kit is available my local dealer
is of no value sadly. nice new building boats everywhere
but service lacking.
As with most modern EFI systems, the fuel pumps only cycle for a brief moment during starting. If the necessary pressure isn't obtained during this momentary period, then the required amount of fuel isn't injected into the cylinders.
Mike can you pump up the primer ball firm with the motor off? If not you probably have a bad mechanical primary (low pressure) fuel pump (there's two there on the port side of the motor...). There's also a shrader valve there off the primary electric fuel pump (VST) that you can take a reading off of and it should be about 35 psi with the key ON. Then there's the mechanical high pressure pump up there on the top rear of the powerhead that's driven by the belt. What color is the primary fuel filter there under the hood? (The first one under the hood...) If it's brown change it, it should be yellow and unrestrictive. The TPS should be set to .62v at the normal idle screw setting. The .48-.52v readings are for when the idle screw is totally backed off. I find the .62v at normal idle screw settings to be right on ( and not more than 5.0v at WOT...). Do you have a service manual for the motor?
-Mike
the primary filter is a little brown. you can pump the primerball firm with
the motor off it will not stay firm?. i will reset the tps sensor to .62 the tps really has no
affect on the hardstarting. i will test the fuel pressure no i dont
have a manual i need to go ahead and get one obviously.
thanks hamfisted. i guess i need to order some pumps.
you can buy rebuild kits I bought mine through a buddy at his cost aroung 27 bucks the diaphram in my top pump had a small hole in it rebuilt all 3 pumps now starts like new again http://xs-s.com/zf/images/smile/emthup.gif
fuel pumps did the fix. neither of the old ones
had any holes in the diaphrams oh well amazing
difference i had forgot how it was supposed
to act. thanks for the help.