Fuel bulb locations

willy · #1 04-17-2007, 02:07 PM

Took my G3 out for it's inaugural run the day before the storm and it ran great once I got it going.
What I have is two motors, a 9.9 and a 60, both have fuel bulbs(primers) on them. These primers are located after the in line cartridge fuel filter.
I had a problem getting a siphon going from the tank to the motors and what I ended up doing was starting the motors one at a time, not both at once, and priming the pump as it ran. The 9.9 bulb eventually got hard but the primer for the 60 hp never fully got hard.
My question for anyone who runs two motors like that set up is this, should'nt there be just one primer bulb from the in floor tank going to the filter which has two outlets instead of two bulbs after the filter, one on each line going to the motors? That is what I had on the V and when I added the 9.9 to it the fuel line already had a bulb but I never had to use it.
Just seems that there should be just one in line fairly close to the tank and before the fuel filter no ?

reelapeelin · #2 04-17-2007, 02:20 PM

Willy, I don't have the two motors, but my cut at it is there should be a bulb just B4 each motor and fairly close to the motor...my bulb is just B4 the motor and AFTER the filter/separator...there may need to be a ''shut-off'' on each line to ''close'' the non-running line to air intrusion...that may be why the bulb never hardened...and are the bulbs standing up?...

...uh and where are the pictures of this little test-launch??...HUH??...

willy · #3 04-17-2007, 02:57 PM

Got a couple of shots will post later, been a little distracted past two days.
What do you mean by standing up Ozzie?
Don't you just need to prime, put some fuel and pressure into the line coming out of the tank, why would you need a bulb in front of each motor? The fuel is in the line already once you prime the lines from the tank, and that is the only place where gravity(going into the tank) where fuel has to be pulled up, once it's out of the tank the fuel pumps should have more than enough to pull it in from around the same level right?

reelapeelin · #4 04-17-2007, 03:15 PM

By ''standing up''...I mean "upright"...the fuel is flowing as straight UP as you can reasonably get it...some systems are not as sensitive to this as others, but on some, it's crucial...the bulb is there to fill the hose goin' UP to the motor ... on some, gravity pulls it back down when not runnin'...if the check-valve in the bulb is workin' properly, that shouldn't happen...that check-valve generally works better in ''upright'' position (arrow indicating direction of flow pointing straight up)...if a bulb doesn't get firm, it may be a bad bulb (even new) or air's gettin' into the line somewhere...

boatnluvr · #5 04-17-2007, 03:26 PM

Wow, that is bizarre. I was just doing an unsuccessful Internet search for this same topic and when I came back to this site, here it is. You guys are the best. Anyway, I still have that original manual pump between the Racor filter and the EFI outboard. So I was told to bypass it, but I was concerned about adding a bulb to prime. So, is inside the rear enclosed compartment, but between the filter and motor an OK location for the primer bulb (Should only be about 3 or 4 feet to the engine)?

randlemanboater · #6 04-17-2007, 03:33 PM

Quote:

Originally Posted by boatnluvr

*So, is inside the rear enclosed compartment, but between the filter and motor an OK location for the primer bulb (Should only be about 3 or 4 feet to the engine)?

Thats how mine is.

With an injected motor, if you get fuel close to it, it *will suck it in.

Willy,

Are both of yer motors new EFI's?

willy · #7 04-17-2007, 03:41 PM

new 60 hp is fuel injuected, 9.9 is carbed. I know the big motor is not sucking air thru carbed motor cause the bulb in that one stayed solid(full of fuel) but the bulb for the big motor never got completely full, hard.
When I was sitting at the launch I could not get fuel to either pumping it for a long time. It wasn't until I tried and started the motor with no prime (the 9.9) and I guess it sucked some vacum out that I was able to get anything into the bulb. It started with whatever fuel was in there and got itself going.
Did the same with the 60 but the bulb never got hard on that one.

willy · #8 04-17-2007, 03:43 PM

Normally when I would use the priming bulb on any of my previous motors you could feel it pump air down and start to suck fuel up with each pump. With this new boat set up I don't get that. Can't figure it out.

macojoe · #9 04-17-2007, 04:35 PM

I don't have two motors, but I have 3 tanks.

I think the ball needs to be near the motor hanging down to keep the prime.

Also I once had a tank that would not prime, Later I found that the vaule was not closed all the way on one tank, after I did that I was fine!!

Maybe if you put a Y of some kind you can shut off to one motor so its not leaking friom there?

Does that make sence? I am so sick, I am going to Doc in the am :-[

willy · #10 04-17-2007, 04:54 PM

No valve MJ, I actually told my dealer I wanted a shut off vlave after the fuel seperator so I could close off the 9.9 completely. They were going to do it but had concerns for some reason and called Yamaha dealer tech support and they told them do not do it. They said that I would not need it.
I don't think that is the problem, for some reason I think it is too far away fuel line run wise from the tank to get a good prime started right away. I will find out next time I take it out and see if now that it has been run if the fuel lines maybe had a vacum in them or something crazy on the initial use of the tanks and lines.
Just seems that if you squeezed a primer bulb coming out of the tank you would fill and pressurise the lines fine. I don't know ???