1973 25hp johnson

[wily]

Ok...thanks.  I’m working on it...got the arm flipped over and moving...was bound up

i took fuel pump off and looked up the number....number traces back to a 4hp

hard to blow thru...and when I do...it makes a squeak type noise

[wily]

I changed the fuel lines...and tried to make it run richer...definitely helped but I think it needs fuel pump...would kind of Peter out...give it a pump or two and right back at it

do you think I should buy omc pump?  It’s 125 on the site you sent me...Chinese one on eBay is 12...heckuva difference 

the one currently on it is omc...number traces back to 4hp.  You think that is problem...too small?

[fishinwrench]

I just installed one of those cheapies from Amazon on a 6hp for a guy today.  I had to take it apart to swap out the back piece because the Chinese one was too thick for the mounting screws......other that that all of the internals look, feel, and smell identical.   

My test tank is still frozen so I can't test it yet, but I have no reason to believe that it won't pump fuel just as good as the OEM ones.    Just don't throw your old one away, because you might need to use the thinner aluminum back piece from your old pump.   

The 4-6-9.9-15 all have the same pump.  The 18-20-25 do have a different part# but I have had all of them apart many times.....and if theres a difference I sure don't know what it would be.   Just make sure that the pump mounts with the fuel outlet nipple in the DOWNWARD position.   Adjust the inlet cap nipple so it is either down or off to either side.  Never Up.  If either nipple is oriented upward then you'll have an air bubble that you can't purge out.

[wily]

Wow...that might be the problem...my supply line comes in from the bottom about 530...and the outlet is right out of the top almost...about 12 o’clock

[wily]

[fishinwrench]

7 minutes ago, wily said:

Wow...that might be the problem...my supply line comes in from the bottom about 530...and the outlet is right out of the top almost...about 2 o’clock

Yeah that's no good.    Somebody may have attempted to overhaul the pump and assembled it wrong.   

There's a tab on the plastic part of the pump with an arrow....and it says "UP". Anytime your fuel tank is sitting lower than the motor...it matters.

[wily]

I had the outer part off this afternoon but can’t remember if I can change the outflow angle

[wily]

Looks like that is inlet I had apart...not sure about getting to the other nozzle...if I take out those two screws...is the springs and stuff in there?

[fishinwrench]

Just now, wily said:

Looks like that is one inlet I had apart...not sure about getting to the other nozzle...is the springs and stuff in there?

Yes there are 2 springs, 2 diaphragms, and 2 plungers.   Very fiddly and a PIA until you've done it about a dozen times.

[wily]

I’ve got the dexterity of a caveman...but I’ll try to switch it around so outlet is lower