Need help, fuel issues....

[smann]

So I posted yesterday about my F115 running sluggish and changing the fuel/water separator and checking the VST filter. Put it in the water today and nothing has changed. WOT is 6 mph and low rpms. Thoughts? Is it a bad fuel pump? Which one? My question is, is it the low pressure fuel pump and is it located on the back of the motor on the bottom left? If it is the high pressure pump, is it located in the VST? I do not have a way to check fuel pressure since I don't have guages. However, the bulb does not stay hard. i can pump it up to hard and then it gets soft quickly. Any help is more than appreciated. Thanks!

 

[99yam40]

Re: Need help, fuel issues....

if you do not have the service manual for your motor or the tools/equipment to troubleshoot/work on it, then buy them or take to someone that does

 

[jhosea1979]

Re: Need help, fuel issues....

So I posted yesterday about my F115 running sluggish and changing the fuel/water separator and checking the VST filter. Put it in the water today and nothing has changed. WOT is 6 mph and low rpms. Thoughts? Is it a bad fuel pump? Which one? My question is, is it the low pressure fuel pump and is it located on the back of the motor on the bottom left? If it is the high pressure pump, is it located in the VST? I do not have a way to check fuel pressure since I don't have guages. However, the bulb does not stay hard. i can pump it up to hard and then it gets soft quickly. Any help is more than appreciated. Thanks!

i had the same problem when i changed my water fuel seperator. my fix was the following
1st i went throug the carbs and found that some how the main jets pluged
I had no way to check the fuel pumps either so two new fuel pumps...
Changed all other fuel filters

And my problem was cured

92 yammy 150 pro v

 

[jhosea1979]

Re: Need help, fuel issues....

and yes a service manual is very helpful if you are going to do your on work on your outboard!!!!!

 

[smann]

Re: Need help, fuel issues....

I have the manual. That's how I got to the VST and removed it. It was clean and I could see through it. I do not have the guages to check fuel pressure, but I imagine it is a bad fuel pump or clogged injectors or both. I'm almost out of hair from pulling it all out.

 

[John W Gehman]

Re: Need help, fuel issues....

I have the manual. That's how I got to the VST and removed it. It was clean and I could see through it. I do not have the guages to check fuel pressure, but I imagine it is a bad fuel pump or clogged injectors or both. I'm almost out of hair from pulling it all out.

Hi,
Be sure you aren't having fuel quality issues. Take the end off of the fuel line, squeeze about a cupful into a clear glass jar using the primer bulb. Good fuel will be clear with a good smell, cloudy means you need to pump till it gets clear.
Good bites to you,
John

 

[smann]

Re: Need help, fuel issues....

Fuel was fresh and less than a week old. Anyway, I sent my injectors to be cleaned and ordered a fuel pump and filter. Hopefully that will take care of me. If not, then I'm stumped.

 

[Ldavidgrover]

Re: Need help, fuel issues....

Try starting the motor on a 6 gallon tank directly to the motor

 

[Ldavidgrover]

Re: Need help, fuel issues....

Better yet do a compression test first