Check out the varnish in my fuel line!

[freightguy]

I was having issue idling last year, was told to change the fuel lines out in case they had never been changed. I was running a can of seafoam in each tank last year but was not getting results. I took my line off the other day and figured I would look inside just for fun. Check out all the varnish that is crumbling inside!

 

[merc245]

Get yourself a water separator/ fuel filter too. The first yr I had a inline filter, I had a piece of crud pass and stick the float on the middle carb stranding me. Installed a WS/FF and was trouble free the next 20 yrs. Good Luck

 

[freightguy]

Get yourself a water separator/ fuel filter too. The first yr I had a inline filter, I had a piece of crud pass and stick the float on the middle carb stranding me. Installed a WS/FF and was trouble free the next 20 yrs. Good Luck

Yeah I will be taking that advice. Looking at the fuel line connector I can see the varnish there as well. I will be getting that, the WS/FF and I am thinking I should probably replace all the fuels in the motor. There are a bunch of short runs there.

 

[merc245]

I'm surprised the hasn't someone chime in about using that grey line. I believe that is some bad stuff, can't remember? I did change out all the lines on that 2.5 even the small carb lines. I think it was about 15 yrs old when I did it.

 

[freightguy]

I'm surprised the hasn't someone chime in about using that grey line. I believe that is some bad stuff, can't remember? I did change out all the lines on that 2.5 even the small carb lines. I think it was about 15 yrs old when I did it.

Hmm, I was going to but the grey line again. Its pretty much what everyone is selling. I think I will do the all the carb lines as well.

 

[freightguy]

I am wondering too if anyone has plugged or removed their tanks vent? Ethanol in fuel is a moisture attractant which is why fuel tanks are no longer vented in new units. I wonder what issues I would create by just plugging the vent line.

 

[SippyRat]

Good read:

http://www.bbcboards.net/mercury-3-...ad-here-upgrade-fuel-supply-system-first.html

 

[freightguy]

Good read:

http://www.bbcboards.net/mercury-3-...ad-here-upgrade-fuel-supply-system-first.html

That was a good read, because I did not have the pulser pump on my list. Those lines look exactly like mine on the inside.

Now what should I do with the carbs to avoid a rebuild? Overall the engine runs very well. My only issue at this time is idling.

 

[SippyRat]

That was a good read, because I did not have the pulser pump on my list. Those lines look exactly like mine on the inside.

Now what should I do with the carbs to avoid a rebuild? Overall the engine runs very well. My only issue at this time is idling.

There's really no question here. With your lines looking the way they do you should service the entire fuel system.

 

[senator-holland]

Overhere we have the same issue; they blame the ethanol in the fuel
On the dutch fast boats forum

 

[freightguy]

Got my new fuel line in and installed a water separating fuel filter. Made a big difference on top end, I looked down at the tach while doing my chine walk and the needle was past the 6000 rpm mark which is the max on the tach. I backed off pretty quick as I read somewhere the max rpm for my engine is 5500.

Now my new issue is I can go out and run around but when the engine warms up it wont idle. coming back to the dock is a bit challenging since it keeps quitting on me when I try to idle in.

 

[ontherocks83]

I had a similar issue. Took me a while to figure it out. All the varnish and sand seemed to have collected in the anti siphon valve off the fuel tank causing running problems. I added a fuel filter/ water seperator after the tank and attached the anti siphon valve to the out put of the filter. Please don't mind the hasty 2x4 installation of the fuel filter. I slapped the filter on there with anything I could get to hold it so I could go for a test ride before the season was out. I will be re-installing the filter properly this winter.

 

[nightrider21]

I've also had that issue on 2005 boat. it's not varnish it's the ethanol fuel affecting the inner liner of the fuel line. Mercury now has a new line that is ethanol resistant. Replace the line all the way from the tank to the motor with the new line.

 

[ezstriper]

the best thing you can do is put a shut-off at the tank and run the engine/line out of fuel if going to sit anymore than a week..