Fuel supply line sizes for 1995 Tournament 192 with Yamaha 175?

[tech_dog]

I don't have access to my 1995 Tournament 192 with Yamaha 175, and I'm hoping to confirm the fuel lines so I can pre-order and get to work when it arrives.

Are all the Tournament 192 fuel supply lines all 3/8?

I believe I'll have these segments:

• Tank to external fuel filter under transom - I think I'm safe at 20ft, thinking it's closer to 15 with bends, using black Trident.
• Fuel filter to bulb - I think I'm safe at 6 feet, guessing it's closer to 4, using grey Trident
• Bulb to Yamaha fuel pipe - I think I'm safe with 3ft, guessing it's less than 2, using grey Trident

Can anyone help me confirm or correct what's above? Is it all 3/8ths, and does anyone have better estimates than what's above so I can reduce waste?

Thanks,

Tom

 

[seasick]

Probably not. Often the line from the primer bulb to the motor itself is 5/16 inch

 

[seasick]

While you are at it, replace the primer bulb with a good replacement, like OEM. Some of the less expensive offerings are garbage.

Remember also that you will be running a new line from the tank pickup to the water separator filter, a line from the filter housing to the primer, and a third section ( smaller diam) from the primer output to the motor filter or pump.

The run from the tank to the separator may be longer than you think depending on how it was routed out of the tank coffin.

 

[DennisG01]

You'll be fine with the 3/8" as 5/16" and 3/8" are interchangeable. They're close enough as makes no difference. Even most primer bulbs specifically say: works with 5/16" or 3/8"

 

[tech_dog]

"You'll be fine with the 3/8" as 5/16" and 3/8" are interchangeable. They're close enough as makes no difference. Even most primer bulbs specifically say: works with 5/16" or 3/8"

Thanks.

I read that outboards over 80hp or so should be 3/8ths, so that plus your comment was enough for me to order. I'm replacing the primer too, so as long as the Yamaha input pipe takes the 3/8" I think I'm good.

For about $400 I'm replacing the entire fuel path, from the tank to the carbs, including the Yamaha internals. I'll put up actual lengths of hose used once I'm done.

 

[seasick]

Although the 3/8 will work for the engine feed, depending on your rigging tube and how the line routes inside the engine, you may have a hard time installing it. I always opt for the original size line. I've cursed the rigging tubes too many times but knew that since all the lines came out, they should be able to go back

 

[tech_dog]

Although the 3/8 will work for the engine feed, depending on your rigging tube and how the line routes inside the engine, you may have a hard time installing it. I always opt for the original size line. I've cursed the rigging tubes too many times but knew that since all the lines came out, they should be able to go back

I figure I've got two possible obstruction points with the 3/8, one going from the filter into the motor well to get to the bulb, the other going into the engine cowling.

According to Yamaha schematics, and I'm still waiting for the boat to arrive, the external fuel line connects to a Yamaha fuel pipe as it enters the cowling. I've got Yamaha parts on the way to replace the pipe and all the fuel tubing, keeping nothing but the fuel pumps, carbs, and filter housing. From the drawings it looks like I'll be OK.

If the hole in the Grady engine well won't allow the 3/8 to pass, I'll either make the hole 1/16th bigger, or I'll order some 5/16 to switch it back. These are my shortest runs so I'm not out $100+ for guessing wrong like I'd be if I guessed wrong on the long run from tank to filter.

Thanks for the input. I'm still getting geared up to dive in as soon as I get my old boat back on its brand new Aluminum trailer.

Tom

 

[tech_dog]

For anyone's reference, my 1996 Tournament 192 with a Yamaha 175TXRT has the following fuel hose lengths:

Tank to Racor fuel filter at starboard transom : 80" of 3/8" below deck hose
Fuel filter to primer bulb in engine well : 60" of 5/16" above deck hose
Primer bulb to outboard : 30" of 5/16" above deck hose

Be sure to leave yourself plenty extra hose, especially the 3/8" below deck so you don't have tension on it as you're routing it through the bilge. Measurements above have a few inches of slop in them.

I used Trident 365 Barrier Lined A1-15 Fuel Hose below deck, and Trident 305 Barrier Lined B1-15 Fuel Hose above deck.
Best prices I could find were here: https://defender.com/en_us/fuel-hoses?manufacturer[0]=31101

The fuel filter housing was rigged with 3/8" input nipple and 5/16" output nipple.
The OEM Yamaha primer bulb had 5/16" nipples.
The OEM Yamaha internal fuel filter had a 5/16" nipple.

I'm pretty sure this was original hose, and my engine was rigged with the fuel hose going through the Yamaha cowling, all the way to the small Yamaha fuel filter. The OEM parts schematic shows the fuel hose terminating at the cowling, going through a connecting pipe, and then going to the fuel filter using a specified Yamaha part. I re-hosed the way it was, no connecting pipe. Does anyone know if this is a bad practice? I decided to copy what I saw and not introduce two more connections.

T.

 

[DennisG01]

I'm pretty sure this was original hose, and my engine was rigged with the fuel hose going through the Yamaha cowling, all the way to the small Yamaha fuel filter. The OEM parts schematic shows the fuel hose terminating at the cowling, going through a connecting pipe, and then going to the fuel filter using a specified Yamaha part. I re-hosed the way it was, no connecting pipe. Does anyone know if this is a bad practice? I decided to copy what I saw and not introduce two more connections.

If I understand what you're saying, you're wondering if NOT using a barb to barb to fitting somewhere at/inside the cowling, and instead just using a straight hose all the way is fine? Makes no difference - six of one, half dozen of the other.

 

[tech_dog]

Thanks. That's what I figured but it's good to get feedback. I'm guessing the extra segment allowed Yamaha to specify everything from the cowling inside.