carb not getting gas???

[mcarlito]

So a litle history. 1966 60hp Johnson sea horse. Bought it last year. Did some work on the lower end, took it out on the water and no WOT. On the way back to the docks, it stalled, got toed back by some nice fishermen, they said it had hapen to them also. So it was late fall, winterized the motor by spraying some stablizer into the piston cylinders, took off the carb and fuel pump and over the winter rebuilt them both. Thought my son and I took the time and did it right. I bought a new gas tank, new fuel line from tank to fuel pump, new hoses from fuel pump to carb. New spark plugs, and new gas 50-1 mix. Today my son and I put on the carb, the fuel pump, placed the hoses on correctly, pumped up the bulb and watched the clear bulb on the fuel pump fill, bulb stayed semi-hard, vent was open on gas tank. Well nothing happened. I checked for spark and I have spark, maybe not bright blue, but spark. The plugs are very dry, so we pulled off the hose leading from the fuel pump to the carb. I was told that a stream of gas should shoot from the hose, gut it barely trickled out. As I said the fuel pump is rebuilt. all the fittings are tight. We even tried pouring a small amout of gas into the carbs but nothing, not even a burp, nothing. I ran the battery down towards the end of our time working on the motor so I'll give it a charge overnight. Should the gas tank vent stay open? That's one on my questions, Am I doing something wrong with this engine?? <br />I can use all the help I can get on this one? Feeling a little down now after spend money and time on this motor. Am I kicking a dead horse??<br />Thank you so much for any imput on this one. My two boys want to see me water ski but I'm not sure if it's going to happen.<br />thanks<br />Mike

 

[jfm1]

Re: carb not getting gas???

yes the vent stays open I would also take the carbs off again and recheck the float it may be stuck someone else should catch this thats knows more than me but it sounds like a stuck float good luck

 

[mcarlito]

Re: carb not getting gas???

Thank Jim,<br />I went ahead and took off the carb and to my knowledge all is well. Re-installed it again and took apart the fuel pump. All looked good as well. Tried two tests, 1 put a finger on the crankcase hose that attaches to the fuel pump. We got air pressure coming from the hos. 2 We once again disconnected the hose coming from the fuel pump to the carb to see what kind of pressure there was from the frul pump. The gas just trickled out of the hose. Where do I go from here??? Also I did a commpression test last fall and recieved good readings from each cyclinder. Any help is greatly appreciated.<br />Mike

 

[fireman57]

Re: carb not getting gas???

Is your primer bulb perhaps on backward? Can you push in the end of the hose unattached and squirt fuel by pumping the primer? yo have to go step by step. If it comes out the end of the fuel line then something sounds like it's not right with the pump. Did you replace the whole pump or just the diaphragms? Have you pulled each line and make sure that they are clear?

 

[Silvertip]

Re: carb not getting gas???

Are you sure the fuel line from the tank is connected to the INLET side of the pump and the OUTLET side goes to the carb? Fuel pump assembled incorrectly after disassembly. By rebuilding, I assume you installed a new kit and didn't just disassemble, clean and reassemble. Not a carb problem at this point if you don't have fuel flow to it.

 

[mcarlito]

Re: carb not getting gas???

To answer Fireman57, the primer bulb is correct. We totally rebuilt the fuel pump, cleaned and blew out all the debre from the pump. <br />Quote:Have you pulled each line and make sure that they are clear? <br />We replaced all the hoses with new but we did not blow into the crackcase fitting. Do you suppose it could be blocked.<br />Question: what is the recommended reading for crankcase pressure??<br />To answer Upinsmoke, all lines are connected to the correct inlets on the pump, we double and triple checked this. Rebuilt the carb completely using manual for instructions and keeping track of all parts and where they are placed in the pump. <br />Thank you very much any other suggestions

 

[fireman57]

Re: carb not getting gas???

I agree with upinsmoke. Almost has to be a fuel pump problem. Sounds like you might have missed some crud in the fuel pump. Do you have access to another complete fuel pump that you could put on from another engine to check it.

 

[mcarlito]

Re: carb not getting gas???

Thank you Fireman57, No I don't have another fuel pump to check. Do you know what the pressure should be coming from the crankcase? When we turn the engine over we get pressure from the hose connected to the crandcase but we are not sure how much pressure there should be? I'm also going to take the pump apart again tonight to see if I overlooked anything but I don't think I'll find anything wrong. I was really careful when I rebuilt the fuel pump.<br />thanks again and by the way I say we because I'm doing this project with my 15 year old son who is really enjoying trying to figure this out. He says it's the fuel pump also. <br />Mike

 

[mcarlito]

Re: carb not getting gas???

Thank you Fireman57, No I don't have another fuel pump to check. Do you know what the pressure should be coming from the crankcase? When we turn the engine over we get pressure from the hose connected to the crandcase but we are not sure how much pressure there should be? I'm also going to take the pump apart again tonight to see if I overlooked anything but I don't think I'll find anything wrong. I was really careful when I rebuilt the fuel pump.<br />thanks again and by the way I say we because I'm doing this project with my 15 year old son who is really enjoying trying to figure this out. He says it's the fuel pump also. <br />Mike

 

[fireman57]

Re: carb not getting gas???

I always liked doing any repair with a young person who wanted to learn. Don't know what the pressure should be. Hopefully Joe Reeves will come along in a minute and let you know. He'll probably have some other things for you to check. If one of the diaphragms is wavy then it needs replaced. Also look for any small pinholes or tears. I had to use a toothpick once to find a small tear that I couldn't see. I know you just replaced them but something could have gone awry.

 

[mcarlito]

Re: carb not getting gas???

Fireman57, What do mean wavy?? What we did notice when we reopened the fuel pump was that the diaphragm was stretched out more then we would have expected it to be. Although it is a new diaphragm, it had that used look about it!!!<br />I really don't think there's any holes in it but when I get it apart tonight I will certainly take a look.<br />Thanks<br />Any other input on this would be helpful,

 

[rwise]

Re: carb not getting gas???

Also check the new lines for air leaks (at the fittings) even the best fuel pump can't overcome an air leak in the lines. just a thought.

 

[Chinewalker]

Re: carb not getting gas???

Couple things to check...<br /><br />You should be able to blow into the "IN" side of a fuel pump, but not into the "OUT" side. There are check valves inside the prevent back flow of fuel. If you're able to blow through both sides, something's up. Also goes for if you can't blow through either side.<br /><br />You should get a pulsing fuel flow out of the fuel pump if you were to remove the fuel line where it enters the carb and let it dump into a coffee can while you spin the motor over.<br /><br />With no gas in the carb, you should be able to blow air into it, continuously, with the carb upright. You should NOT be able to blow air into it with the carb inverted, as that would set the float valve to closed.<br /><br />- Scott

 

[mcarlito]

Re: carb not getting gas???

Hello Scott,<br />I'm home now and will try what you are advising, very logical tests and I thank you for informing us how to use our minds instead of our pocketbooks, which may I add is looking pretty slim these days.<br />Thank you Sir,<br />Mike and son Zach, Still digging It!!!

 

[mcarlito]

Re: carb not getting gas???

Just came back in. I ran all the tests that were recommended and more. Did a syncronation adjustment as well. This is what we observed. After blowing into everything the correct way, it all works the way it was explained. I took apart the fuel pump, checked for holes in diaphrapm then I reinstalled it and stretched it alittle before screwing the body together again. We still have doubts that the pump is working correctly because when we take line out from the fuel pump going to the carb and observe the pressure, the gas just trickles out like a weak pee, really weak. Can you explain how much should be coming out and with what pressure??<br />thanks to all for your help<br />Mike and son Zach

 

[mcarlito]

Re: carb not getting gas???

We still have doubts that the pump is working correctly because when we take line out from the fuel pump going to the carb and observe the pressure, the gas just trickles out like a weak pee, really weak. Can you explain how much should be coming out and with what pressure??<br />What could be the problem if the crankcase pressure is low??

 

[Crappie_Fan]

Re: carb not getting gas???

We even tried pouring a small amout of gas into the carbs but nothing, not even a burp, nothing.

Do you mean you sprayed gas directly into the carb and it did not even try to start? If so then you probably have more than just a fuel problem. Hopefully someone with more knowledge will jump in and give some better trouble shooting advise.

 

[mcarlito]

Re: carb not getting gas???

I have to say that I poured the gas instead of spraying. Is it a big difference?? Shouldn't I have gotten something??

 

[Crappie_Fan]

Re: carb not getting gas???

Just for trouble shooting sakes mix some gas up in a spray bottle and have some one crank the motor while you mist some gas into the carb. Make sure you have the water hose on your motor also, dont wanna wear your waterpump out.<br /><br />Good Luck

 

[rwise]

Re: carb not getting gas???

when you poured gas into the carb it should have spit or poped or tried to run. putting a little gas directly into the cylander would also do the same. When you took the cars apart (the second time) was there any gas in them? points at .020 and plugs at .030?