Oil thined by gas in only 30 hours

[Toulla]

2001 F25ELHZ engine. In 30 hours of running time I noticed the oil had thinned out. I drained it and sure enough it was thinned by gasoline. However, the oil level was not too high. The engine has about 430 hours on it and it runs so sweet after an oil change. Is it time for a new fuel pump? The thermostat has been changed. I always use yamalube 10W30. I would rather use 10W40. Any recommendations on what brand for 10W40 oil?

Thanks to all.

[Toulla]

please help

C'mon guys, she did not uused to thin the oil like that before. Please give me your input. I should mention that when I prime the fuel line the ball does get firm.

[boats.net]

Could be a bad fuel pump(remove it and pump primer bulb to see if gas leaking out of it) or float valve in carb sticking open and flooding out.

[Toulla]

Thanks

Thanks, I will check both. Again, thanks for the input.

[bigfish1229]

Why Not Use Yamalube 10w-40?

[Toulla]

Don't make it any more

I would, however, Yamalube no longer comes in 10W40. Only 20W40 and 10W30. I could be wrong.

[boats.net]

Yamaha only has the 10W40 in Watervehicle(waverunner) oil, LUB-10W40-WV-12 10W-40 4W WATERCRAFT
The outboard is
LUB-10W30-FC-12 10W30 MARINE FC-W 12, case of 12 quarts
LUB-20W40-FC-12 20W40 MARINE FC-W 12, case of 12 quarts

[Toulla]

yamalube

Thanks for the info, that is what I thought. Unfortunately I belive that an older motor is better off using the 10W40 oil.and it is not avaliable. What's a good alternative? (brandwise) and no , I don't want to use a synthetic product.
Thanks.

[Toulla]

Tested

I just removed the two bolts holding the fuel pump onto the engine, squeezed the priming ball till hard, no gas came out of the pump, does that eliminate the pump as the potential problem?
How should I check for a bad carb float?
Thanks.

[boats.net]

Fuel pump is ok. You would need to remove and clean carbs, If there is fuel inside float replace it.