Fuel pressure problem???? Mariner 140 HP

[madlad]

I finally got to take the boat out I have been working on. Had problems getting it started, wasn't getting any fuel to carb. 1 or 3. Clean the carb's and finnaly got the boat started. When running it across the water, it was running very bad, couldn't get it up to running speed, without it falling on it's face, or barely running like it was starving for gas. Had the person with me I purchased the boat from and we played around with the timing and fuel. He had me drive the boat while he was fooling with the engine. He started pumping the bulb while we up the RPM and the boat started running really good. He said he thought it was in the fuel pump, as long as he was keeping pressure on the bulb the boat ran fine. I'm not sure if they will have a fuel pump in stock and I'm getting ready to go on vacation and want to take the boat with me. Can I put an electric in-line fuel pump on the boat to keep up the fuel pressure? If so what PSI would I need to use?

Thanks you guys for all the help.

Tony

 

[Barnacle_Bill]

Re: Fuel pressure problem???? Mariner 140 HP

For safety reasons it is not a good idea to install an electric pump on your motor. If the motor stops running for whatever reason you want the pump to stop pumping immediately.

 

[madlad]

Re: Fuel pressure problem???? Mariner 140 HP

Bhile

By the problem I'm having does it sound like it is the fuel pump? I'm sure they should have a rebuild kit for it at the shop when I check in the morning. I just thinking that funky crap in there screwed up my diaphram. Am I on the right track?

 

[j_martin]

Re: Fuel pressure problem???? Mariner 140 HP

Bhile

By the problem I'm having does it sound like it is the fuel pump? I'm sure they should have a rebuild kit for it at the shop when I check in the morning. I just thinking that funky crap in there screwed up my diaphram. Am I on the right track?

Kit's about 20 bucks. Takes less than an hour to put in, unless it's the first time the new valves are installed and you have to hunt down a drill bit in a messy shop. The old ones are rubber. The new ones are clear plastic.

No big deal, except if you try to run it like that, you'll soon burn it down. 2 cycle motors can not live with almost enough fuel.

 

[madlad]

Re: Fuel pressure problem???? Mariner 140 HP

J Martin,

I don't want to do anything that will hurt the engine. If I get the fuel pump on it this morning can I test the engine with a water hose on it or do I have to take it to the lake and run it to be sure that corrected my issue? Also with this engine sitting for a few years with that funk in the fuel system, could the issue be in the carb's as well? We cleaned all of the carb's the weekend I bought the boat, but we didn't put kit's in them.

 

[j_martin]

Re: Fuel pressure problem???? Mariner 140 HP

J Martin,

I don't want to do anything that will hurt the engine. If I get the fuel pump on it this morning can I test the engine with a water hose on it or do I have to take it to the lake and run it to be sure that corrected my issue? Also with this engine sitting for a few years with that funk in the fuel system, could the issue be in the carb's as well? We cleaned all of the carb's the weekend I bought the boat, but we didn't put kit's in them.

How can you "clean" carbs without putting kits in them? The gaskets are good for one reliable squish. The gasket kits is just a few bucks, and that's all you really need unless you identify a problem like a sunk float.

A fuel pump kit is considered by many, including me, as an annual maintenance item, right along with water pump and a grease job.

Everything on this engine is in the elementary, or simple class as far as mechanical intricacy. If you get the fuel pump kit and follow the instructions, you can't do anything but help your engine.

If you want to be good to your engine, I suggest you get the mercury maintenance manual. Clean the carbs properly, rebuild the fuel pump, replace the fuel filter, and probably all the hoses. While the carbs are off, check the bleed lines and bleed check valves.

Then when you have it all put back together, do a linkage and timing procedure, as put forth in the above said manual.

When these engines are running right, they are very strong, and almost bullet proof. However, there are many "tune" items that can hurt or even grenade them. That's because of the extreme power generation in a small package.

hope it helps
John
John

 

[madlad]

Re: Fuel pressure problem???? Mariner 140 HP

J,

It was late one night when I went and looked at the boat, and nothing was open to buy the kits. I have the fuel pump rebuilt and the boat cranked right up. Now I have gas leaking from the carb's. While I was at the shop, I picked up 3 carb. kits, they came with everything but the floats. They didn't have the floats in stock, but the night we cleaned the carb's out we set the float in some gas we were using to clean with and that floated fine. I'm going pull the carb's now and start work on those. I did buy a service manual for the Mariner 2- 220 HP engine just after I bought this boat, and that is where I have been doing some of my reading as well. Well let me go look a seen how the carb's come off, the night we pulled them he was in the boat taking them off while was cleaning them.

Thanks for the info will post back how thing go.

 

[madlad]

Re: Fuel pressure problem???? Mariner 140 HP

Well no luck with the carb kits. It's now leaking gas from the bottom carb and will not start. I guess the leak could be a bad float or the setting of the float is off. Is there anyone on this forum from the Memphis TN area that can help me figure this out. I'll more than happy to pay someone come help me with this or I can come to you.

Could it be possible with all of that crap the was in the fuel system could have damaged the carb's to the point that a kit will not correct it?

I'm open to all and any idea's, I don't mind turn a wreck and getting my hand dirty. It's crazy after I put that fuel pump on, other that the carb's leaking a little bit the boat crank right up and I let it set and run for a while, could see gas dripping from the from of the carb's and I just just think it should have been doing that. Well at least now I know how to pull the carb's and could get some floats to put in it or try adjusting the one's that in there. They should be ajusted accord to the instructions I follow.

Man what a long 2 days !!!!!!!!!!!!

 

[donzi gt230]

Re: Fuel pressure problem???? Mariner 140 HP

Since you're doing the carbs and pump, it's probably a good time to dump out your old fuel and install a new filter so the new stuff doesn't get contaminated. If that leaking carb is flowing out the air intake, its likely a float or needle issue; otherwise could be anything. When you get it all sorted out do the synch! I just did one today and am SO happy I did.

 

[madlad]

Re: Fuel pressure problem???? Mariner 140 HP

I still have the old tank out of the boat getting that old funk cleand out. I using a new 6 gal. fuel cell and have all new lines and bulb. On the top carb, where does the throttle control need to be setting? It's shaped like a V and I have the lever that pushes it in the middle of that. When I put the throttle in fast idle I don't see it moving the flaps on the carbs, but if I push the throttle to forward and wide open, I can see it open the carb flaps wide open. Do I have that in the right spot. Last night when I got it all back together and it cranked for a mininute the motor was running at a very low RPM, not a fast idle, then it shut off.

I know the bottom carb leaking is one issue, but could I have my linkage off? This Clymer service manual I have doesn't show that or at least I can't find it any where.

Thanks all, will keep trying what every you pro's out here tell me to try, GOD knows this is all new to me.



Tony

 

[madlad]

Re: Fuel pressure problem???? Mariner 140 HP

Thanks guy for all of your input. The problem is resolved and the old girl is cranking and running good with no carb?s leaking. I was able to take it out last weekend and run it for a couple of hours, the engine ran fine. The steering is very stiff, but this boat had been setting for several years, so I think that cable will need to be replaced. The boat didn?t leak any water, and rode well. Now that I know the motor is good, I can continue on with restoring it and have it ready for next season.

The resolution!
Took the carb's back off, carried them to a friends place that had allot more cleaning equipment and tools to work with than I had. We completely disassembled them and let all of the parts soak in ethanol, more of that old harden fuel came out of area that appeared to be clean or that couldn?t be seen with the naked eye. Next we glass beaded them inside and out, soaked them again in ethanol to finish the cleaning process. Once we had the carb?s as clean as possible we took our time and build each one to factory specs according to the Clymer service manual. Then we took each cab and connected a fuel line and test the floats on the work bench before I put them back on the boat.
When I put the carb?s back on the boat I install an extra inline filter between the fuel pump and the carbs. for extra protection.