70hp 93 'rude fuel pump

[jvaccarino]

We've come to a decision that the problem lies at the oil pump, or the fuel has leak/ air in it.. An excess of oil is entering the pump at low RPMS. My only choice to fix the pump is to buy a whole pump ($300 + ) There is not a kit for the oil side.. Tell me what you think.. is it the entire pump or a leak in the fuel line itself?

The boat was bought 2 years ago... Last owner said a new fuel pump was installed.

 

[R.Johnson]

Re: 70hp 93 'rude fuel pump

The service manual detail's how to check the fuel, oil pump. Have these test's been done? A fuel restriction will effect the pump as much as a air leak. This is a vacuam, pressure test. Have both been done?

 

[Solittle]

Re: 70hp 93 'rude fuel pump

Go to pre mix?

 

[jvaccarino]

Re: 70hp 93 'rude fuel pump

R.Johnson : No, vacuum tests have not been done.. I plan on taking the boat out tomorrow and giving a thorough examination.. I've got the Seloc book for my engine.. Have to find it.. but these tests are things I can perform?

I thought about going to pre mix.. BUT would have to swap out fuel pumps to do that... still costing $250.. (thru local marina).. Unless there is a way to bypass this??? What about the "no oil alarm?"

 

[rickdb1boat]

Re: 70hp 93 'rude fuel pump

Might check this link out. Bypassing the oil side is easy if you want to pre-mix....


http://www.boatpartstore.com/tips.asp ] Click Here [/url]

http://forums.iboats.com/bbBoard.cgi?a=viewthread;fid=28;gtid=680142 ] Oil side disconnect[/url]

 

[DHPMARINE]

Re: 70hp 93 'rude fuel pump

I doubt your pump is over - oiling.Probably under - fueling.I would take the motor cover off,and squeeze the fuel primer bulb,looking for leakage anywhere.

Last time I worked on a problem like yours,a cracked fuel filter was sucking air (faster than it could leak).

DHP

 

[jvaccarino]

Re: 70hp 93 'rude fuel pump

I actually just checked the fuel.. I removed the filter, pumped the gas into a jar, then put the filter back, pumped the gas, and the gas came out fine both times.. no "foaming"... Is there something else I'm missing?

 

[jvaccarino]

Re: 70hp 93 'rude fuel pump

And btw, the fuel pump IS new-ish (4 yrs old)

 

[DHPMARINE]

Re: 70hp 93 'rude fuel pump

4 years old isn't new-ish in my book,but I still wonder if you are sucking air somewhere in the fuel system.

Squeeze the fuel bulb with everything connected and look for any leakage.

DHP

 

[jvaccarino]

Re: 70hp 93 'rude fuel pump

OK with everything connected, still dont see a fuel leak anywhere.

 

[jvaccarino]

Re: 70hp 93 'rude fuel pump

Question.. should oil drip out of the carburetor? I see a slight amount of oil dripping out of the carbs, on the side, not the front where the openings are..

 

[jvaccarino]

Re: 70hp 93 'rude fuel pump

How can I determine where my problem lies? Bypass the VRO? If engine still smokes a lot, then it lies in the carbs? Or still a fuel issue somewhere?