Rebuild carb - Volvo Penta 5.0

[chadderkdawg]

Hello all, working on getting the boat ready for Memorial day weekend, she cranks over fine, but won't fire. A bit of starter fluid in the carb does get it to pop off, but it won't keep running. Assuming the carb needs rebuilt, however I'm an EFI guy, never have worked on carbs much. Does anyone have a detailed guide on how to rebuild a carb? Video or document? Anything will help, I see I can get the rebuild kit from iBoats which I'll probably order today. Thanks everyone!

 

[Augoose]

They are standard holly carbs for the most part - lots of videos on line with the breakdown process. I don't recall seeing one here but that doesn't mean that someone hasn't posted one.
I'd do a couple google searches just to become familiar GENERALLY with the components - fuel enters into the bowl which provides somewhat of a reserve when the demand for fuel is high. The fuel level in the bowl is controlled by a float valve which turns on/off the flow of fuel into the bowl. In the bottom of the bowl are the jets which allow fuel to pass into the throat of the carb where it is mixed with air - then passed into the intake and into the combustion chamber. Then you will have a power valve which provides additional fuel when the demand is there.
Carbs for the most part are pretty easy to rebuild if you just take your time. Often times instructions come with the rebuild kit as well. Pick up a couple of plastic fishing lure boxes with all the square compartments to store components as you remove them. As you pull items off in order, place them in order in the square bins. When its time to rebuild it, exchange replacement items as necessary and just work backwards.

 

[jimmbo]

I would be checking to see if the carb is getting fuel before proceeding to gut it. Fuel pump, anti-syphon valve?

 

[Augoose]

I PM'd you a holley rebuild manual.
Like jimmbo said, checking fuel supply would certainly be a good first move.
I'm of the opinion that rebuilding/cleaning carbs is part of routine maintenance and keeps things performing optimally. Rebuilding the carb is not as daunting as it first seems and if it looks "gunked" up from the outside, it might be time. My .02 cents.

 

[jimmbo]

My Holley 500 cfm 2bbl is 14 yrs old and as never needed cleaning or rebuilding. It had the fuel bowl off once in 2003 to check for a ruptured power valve.

 

[Augoose]

Congrats.

 

[jimmbo]

No needs for the sarcasm. Just fresh gas, and use of stabilizers during storage

 

[bruceb58]

What is the year and/or model number?

 

[Augoose]

Jimmbo, I recognized your point and suggested it was a good idea. I also believe there is nothing wrong with maintaining a carb. You made it a point to continue to suggest I was wrong by stating you've run your carb for x number of years without a problem and not needing a rebuild. I was not as fortunate as you and I had to rebuild my carb on my 5.0 gl three years ago, it and needed it. While you say there was no need for sarcasm, I would say there was no need for your 2nd statement either.

I'm only trying to assist the OP with his issue.

 

[jimmbo]

Augoose, I wasn't saying you were wrong. I was just proud of the fact I've never had to clean the carb, and it was probably due to fresh gas and good storage policy. If it appeared an affront to you, I apologize.

 

[bruceb58]

I am proud that my carb never needs rebuilding and I don't use any stabilizer and use ethanol fuel!

Back to the OP. We need to find out if he has an electric fuel pump or not and also need to find out if the accelerator pump squirts any fuel when he pumps the throttle.

 

[chadderkdawg]

Whoa guys, calm down! This carb does not need rebuilt, i took it off over the weekend and found the screen between the fuel line and the carb was full of gel and garbage. I got that cleaned out and everything put back together and the carb is supplying fuel now, however it still wont run, I'm assuming the gas is garbage, I think the fuel in the tank is about 2 years old. I can get the motor running and started on ether, and it will chug a few times on the gas from the tank but dies. Now I have to figure out how to get 25+ gallons of gas out of this tank, ugh...

 

[mklearl]

Use an electric fuel pump from an auto part store... make sure it is rated to pump gasoline!

 

[chadderkdawg]

Use an electric fuel pump from an auto part store... make sure it is rated to pump gasoline!

That part is a no brainer, the part I'm struggling with is how to get a siphon hose into the gas tank... I cant see the tank from the engine bay, and all the fuel lines that I can get too are hard lines. The filler neck is super long with a 90 degree turn in it too....

 

[mklearl]

It's a hard line going from the tank to the fuel pump assembly? My bad. I have a 5.0gi with a rubber hose going from the tank to a fuel filter/ fuel pump. Sorry.

 

[chadderkdawg]

It's a hard line going from the tank to the fuel pump assembly? My bad. I have a 5.0gi with a rubber hose going from the tank to a fuel filter/ fuel pump. Sorry.

I'll check that again... **** is hard to get to...

 

[mklearl]

If not I think you could remove the hard line at the filter and screw in a fitting with a hose barb on the other end. I'm not sure how your fuel system is configured, but I do know that I had 150 gallons of 10 year old fuel to pump out so I definitely feel your pain. Good luck!

 

[bruceb58]

There pretty much has to be an access point to get at the fuel sender and all fuel hose connections. Often, its an access port in your floor.

 

[slag]

Mr. Gasket fuel pump from the auto parts store is about $50.00. I just did the same thing a couple weeks ago. Pull the fitting off your fuel/water separator, splice 10-15 feet of fuel line to it with a brass nipple, and suck the old gas out into plastic fuel tanks. Most of the gas I removed was milky and smelled of varnish. I then pulled the holley carb off the manifold and it was full of water and chunks of cottage cheese looking crap. My rebuild kit came in this week and I will rebuild the carb and put it back together this weekend. Looking forward to getting back on the water after replacing the fuel/water separator filter and putting the carb back on the boat. Meant to do this last spring but got sick and wasn't able to boat all year, let alone get my boat out of storage.

 

[chadderkdawg]

Mr. Gasket fuel pump from the auto parts store is about $50.00. I just did the same thing a couple weeks ago. Pull the fitting off your fuel/water separator, splice 10-15 feet of fuel line to it with a brass nipple, and suck the old gas out into plastic fuel tanks. Most of the gas I removed was milky and smelled of varnish. I then pulled the holley carb off the manifold and it was full of water and chunks of cottage cheese looking crap. My rebuild kit came in this week and I will rebuild the carb and put it back together this weekend. Looking forward to getting back on the water after replacing the fuel/water separator filter and putting the carb back on the boat. Meant to do this last spring but got sick and wasn't able to boat all year, let alone get my boat out of storage.

Wow I don't think my gas is that bad, but it is leaving a bunch of gel in the carb screen... Thanks for the procedure, I'm going to try exactly that.