1958 Fastwin Not Getting Fuel

[halsteadmorris]

Firstly: 1958 18hp Evinrude Fastwin model 15024

I purchased this motor close to a month ago and have been having trouble keeping it running. After waiting on a clear fuel line I have discovered that the motor does not pull gas in at all. Unless gas is directly pumped into the bowl it will not get fuel. I’m assuming this is due to no vacuum.
I noticed what looks to be a poorly made gasket on the carb. I’ve ordered a new one. Could that be cause? The seller claims to have gone through the gas can and it seems to check out but I may go through that as well.
I’m waiting on a carb kit to ship in. Is there anytime I should be checking in the mean time? Is there a reliable way to test for a vacuum leak so o can confirm that’s my issue?

I’ve attached a picture of the suspect gasket as well as the fuel that is still on the line after I disconnected it while running to see if it was getting fuel.

 

[F_R]

Firstly: 1958 18hp Evinrude Fastwin model 15024

I purchased this motor close to a month ago and have been having trouble keeping it running. After waiting on a clear fuel line I have discovered that the motor does not pull gas in at all. Unless gas is directly pumped into the bowl it will not get fuel. I’m assuming this is due to no vacuum.
I noticed what looks to be a poorly made gasket on the carb. I’ve ordered a new one. Could that be cause? The seller claims to have gone through the gas can and it seems to check out but I may go through that as well.
I’m waiting on a carb kit to ship in. Is there anytime I should be checking in the mean time? Is there a reliable way to test for a vacuum leak so o can confirm that’s my issue?

I’ve attached a picture of the suspect gasket as well as the fuel that is still on the line after I disconnected it while running to see if it was getting fuel.

That is a new bowl gasket, so somebody has already been in there. Are you using a pressure tank (original), or has the motor been converted to a fuel pump? One way or the other, those are the ways that gas is fed to the carburetor.

 

[rowerowe101]

Yeah what is previously mentioned about checking the pumps would be the first step after making sure no air/fuel leaks from everything from tank to carbs.

Check the vent to see if it's open if it's not a pressure tank, as well as pumping the primer bulb when it start's to bog down or however it dies. If it runs while pumping bulb it will most likely mean it;s the pump.

 

[halsteadmorris]

That is a new bowl gasket, so somebody has already been in there. Are you using a pressure tank (original), or has the motor been converted to a fuel pump? One way or the other, those are the ways that gas is fed to the carburetor.

It’s a pressure tank. I assumed (hoped)
the problem was in the lines but that does not appear to be the case. Absolutely 0 hiss when I remove the tank cap after running it so clearly it’s not building up a vacuum. I just don’t know where else to look other than the lines.

 

[racerone]

Nope.-------The tank needs to build up PRESSURE in order for fuel to flow to the motor.-----Any pictures of tank and hoses coming off the motor.-----Is there a hose coming off the intake manifold that supplies crankcase PRESSURE to the tank ?

 

[halsteadmorris]

Yeah what is previously mentioned about checking the pumps would be the first step after making sure no air/fuel leaks from everything from tank to carbs.

Check the vent to see if it's open if it's not a pressure tank, as well as pumping the primer bulb when it start's to bog down or however it dies. If it runs while pumping bulb it will most likely mean it;s the pump.

It has

Nope.-------The tank needs to build up PRESSURE in order for fuel to flow to the motor.-----Any pictures of tank and hoses coming off the motor.-----Is there a hose coming off the intake manifold that supplies crankcase PRESSURE to the tank

I added a few pics. I didn’t realize that’s what the air hose was for. I guess the carb has nothing to do with the lack of pressure then, right?

I’ve got some clear tubing I know is 100% good. I’ll bypass the line and connector and feed it straight to the tank. That’s help me rule out the connector and the line I suppose.

 

[oldboat1]

You don't have a hose from the filter bowl to the carb. (Bowl needs to be cleaned -- looks like nasty contamination, and might be water visible on the bottom.)

Clean the tank as well. Test run with a gallon of fresh fuel with 24:1 mix.

 

[halsteadmorris]

You don't have a hose from the filter bowl to the carb. (Bowl needs to be cleaned -- looks like nasty contamination, and might be water visible on the bottom.)

Clean the tank as well. Test run with a gallon of fresh fuel with 24:1 mix.

Hose is not connected to filter bowl because I bypassed it with a clear fuel line straight to the tank to see if there were air bubbles etc running through. I also was replacing some aging hose clamps

 

[oldboat1]

And the sintered filter and bowl gasket?

 

[halsteadmorris]

These were old pictures on my phone from when I took the carb off. I have since put everything back together, attached all hoses, etc. These are not current photos. Sorry the the confusion I should have made that more clearly when I posted them

 

[oldboat1]

and the filter, and tank cleaning, and fresh fuel, and fuel to 2-cycle ratio?

 

[halsteadmorris]

and the filter, and tank cleaning, and fresh fuel, and fuel to 2-cycle ratio?

Tank is clean. Filter is currently being cut out for simplicity. Fuel is very fresh and mixed 24:1. It starts and runs if fuel is squirted into the carb using the primer bulb, but there is no vacuum whatsoever. I’m just unsure of whether or not something other than a leak in the line or tank could cause this issue.

I’ve seen exhaust blow out the air line when I disconnect the dual line.

 

[oldboat1]

no primer bulb used with the pressure tank system. Manual fuel feed is the button on the tank in front of the handle. If you put a bulb in the fuel hose, take it out and use a straight connector to reconstruct the hose, or get a new hose.

 

[halsteadmorris]

Sorry, wrong nomenclature. Manuel fuel feed is what I was referring too

 

[racerone]

There is no EXHAUST anywhere near the fitting where you plug in the fuel connecter.----The motor pumps PRESSURE into the fuel tank.---Study how this simple system works.----Fixing it will then be easier !

 

[cc67]

This might help.