vacuum line

[jkeating]

engine #
0C865660

So off the lift pump there is a vacuum line I'm guessing that goes to the back of the carb? What is it for? I found some kindgunk plugging it.

 

[achris]

Re: vacuum line

It's not a vacuum line. It's on the backside of the primary diaphragm in the fuel pump. It connects to a port on the carb, near the top... If the pump diaphragm ruptures the fuel goes up that hose and into the carb, stalling out the engine. If it didn't, the fuel would end up in the engine oil pan, creating a potentially explosive situation.

Chris....

 

[jkeating]

Re: vacuum line

So would that being plugged make my motor run like crap?

 

[achris]

Re: vacuum line

It shouldn't. If the line was full of fuel and spilling into the carb, then yes...

Take the line off the fuel pump end and clean it out (doesn't have to be perfect, just enough so air/fuel can move though), then put it back on at both the pump and carb ends... It's a safety thing...

Chris.....

 

[jkeating]

Re: vacuum line

Ok so next Question. How do you properly Adjust the choke? I Just bought a Reman carb and the choke adjustment is set all the way counter clockwise

 

[Silvertip]

Re: vacuum line

Stone cold engine. Open the throttle a bit. Rotate the adjustment disc until the choke just barely closes. Tighten the screws. Go boating. DO NOT DO THIS ON A WARM ENGINE.

 

[achris]

Re: vacuum line

2 different ways...

First possible way... Run the engine till it's fully warm, then adjust the choke so it is fully open.
Second way, when the carb and engine are cold, adjust it so the choke plate is just closed... Then check it's fully open when the engine's warm...

Chris...

 

[jkeating]

Re: vacuum line

thanks for the help bud. It got to dark tonight so I didn't get time to finish with the vacuum line. so hopefully tomorrow I ill finish that and fire her up... Ive been having carb issues and broke down and bought a reman. Im trying to get it running so I an take it out camping next weekend

 

[jkeating]

Re: vacuum line

One more question for the night... I bought a fuel filter for the fuel pump a month or so ago and been learly about changing it. I saw what looks to be a set screw on top of the pump with a piece of wire holding the screw in place. Is that adjustable? or can I just take it all apart still on the motor and change out the filter?

 

[achris]

Re: vacuum line

The wire is a 'lock-wire' and is there to stop the screw rattling open and filling the boat bilge full of fuel.

To replace the pump filter, just the frame over to one side and pull the cover off the pump. Be careful, there is a spring inside the cover, pushing the filter down. Don't loose it, it needs to go back in... And yes, this can all be done with the pump still on the engine...

Don't forget to put a new lock wire in....

Chris.....

 

[jkeating]

Re: vacuum line

hmmm, im starting to wonder if I have a bad fuel pump.... Ive been reading around and read that if the clear houe don't have fuel in it, the pump is going bad?.....

I think ill change the filter tomorrow, finish the carb work and start her up... Ill post more tomorrow if I run into more issues.


As of now, I've replace plugs, wires, cap, rotor, carb, filter in the carb, t stat, water pump, flame arrestor, motor oil, out drive oil :facepalm:

 

[achris]

Re: vacuum line

No, that hose from the bottom of the fuel pump should NOT have fuel in it. If there is fuel in it, the fuel pump diaphragm has ruptured and the pump needs to be replaced...

 

[jkeating]

Re: vacuum line

well, I couldn't tell ya since the dang thing was plugged with crap at the top 4'' and bottom 4''. Almost looked like mud when I was picking it out, but on the carb elbow and fuel pump connections, it was a greenish blushing tint and was sticky.

 

[achris]

Re: vacuum line

well, I couldn't tell ya since the dang thing was plugged with crap at the top 4'' and bottom 4''. Almost looked like mud when I was picking it out, but on the carb elbow and fuel pump connections, it was a greenish blushing tint and was sticky.

Yeah, that's pretty normal. The greenish blue tint is just the copper (as an alloy component of brass) corroding in the presence of sea air.

Salt water (NaCl-H2O) + Cu = CuCl2 + NaOH + H2(as gas)

CuCl2 is greenish blue....

Chris.....

 

[jkeating]

Re: vacuum line

UPDATE

I got the new carb all hooked up and bought some starting fluid to get it started. SHE RUNSSSSS

As stated before Ive put a new impellor in the lower unit, newer thermostat in, new water pump in, new plugs, wires, cap, rotor, reman carb, new fuel filter (in the mechanical pump and at the carb)

The start of this problem was the choke wasn't operating correctly and would not open at all. So I looked for a new choke and could not find anywhere that had one. So I just bought the reman carb. As I said earlier the carb was the last thing ive done and it still isn't running quite right.

Before I replaced the carb I couldn't keep it running, and the choke would remain closed causing a very irract idle and stalling issues until it got up to speed. Now that I have the new carb on, the choke operates correctly, but im still have idleing issues. It sounds almost like the boat has a cam in it lol. Once you open it up, it back fires once or twice and starts running better.

Do you think that the choke issue fowled out the plugs? Once I replaced them, ive taken the boat out once and started it a handful of times in the drive way thought the process of replacing everything. I have a new set ordered and they will be here tomorrow so I will replace them then. OR could it be a timing issue? Im kinda at a loss right now on what to do next

 

[achris]

Re: vacuum line

Definitely check the timing. The other check I would do is a 'plug lead pull' test. One at a time pull the lead of each spark plug and check that each cylinder is firing and contributing evenly to the engine. Obviously do this with an insulated tool.

Chris......

 

[jkeating]

Re: vacuum line

I am pretty mechanically inclined. BUTTTT I don't feel that I could do the timing and I don't have a gun to do it. So with that being said, I am running out of time. I need it done by Friday around 330 pm so I think tomorrow I will find a boat mechanic around the area..... Ill explain everything ive done to him and see what he says is wrong to actually see if he knows what hes doing. Ill then explain that I believe its the timing.. :beaten: :frusty: . Well see how that goes. Does anyone know of a decently priced boat mechanic if the Omaha Nebraska area? :noidea:

 

[achris]

Re: vacuum line

Adjusting the timing is one of the easiest jobs. Just run the engine until it's warm, and have it just idling, on the trailer and out of gear is fine. Have the timing light hooked up to #1 spark plug lead and point the flashing end at the timing marks. The line on the engine pulley should line up with the 8?BTDC mark on the timing tab. If it does, shut off the engine and pack up the tools. If it doesn't, take a 9/16" wrench and slightly loosen the bolt holding the locking bracket at the base of the distributor. Turn the distributor very slightly one way or the other until the line on the pulley lines up with the 8?BTDC mark on the tab. Tighten the screw, pack up the tools. Honestly, including the coffee break, it's a 5 minute job....

Here's a nice timing light (not expensive either)...

Actron/Inductive timing light (CP7527) | Timing Light | AutoZone.com

Here' a REALLY nice timing light (quite a bit more expensive... But really nice (I have one ))

Innova/Heavy duty housing pro timing light with tool case, test up to 9990 RPM (INN5568) | Timing Light | AutoZone.com

Chris....

 

[jkeating]

Re: vacuum line

ok, your right. that isn't too bad.. plus I have a few buddies that work up there so im sure I could take it back anyways... So if you don't mind me asking how does that thing work? Like I said I never used one but im sure I could figure it out...

 

[achris]

Re: vacuum line

ok, your right. that isn't too bad.. plus I have a few buddies that work up there so im sure I could take it back anyways... So if you don't mind me asking how does that thing work? Like I said I never used one but im sure I could figure it out...

The old name for them was 'powered timing light'. As opposed to the VERY old school xenon timing lights (really basic. that one you disconnect the spark plug lead and put the timing light in the circuit. When the spark plug fired, the xenon tube in the gun would flash (fired by the few thousand volts destine for the spark plug). No batteries, no other connections, just the spark plug lead.).

The powered timing light.... Basically there is a pick-up that clips to the spark plug lead. Usually #1. No need to disconnect the plug lead, it clips right on, next to the plug. That has a coil in it and the pulse that fires the spark plug induces a voltage in the pick up coil. That's used by the circuitry inside the gun to fire the flash tube... So basically, when the spark plug fires, the gun flashes. Oh, there's a couple of other (low voltage) leads that connect to the battery.... Red to positive, black to negative...

That's it!

Chris......