Yamto 302 fuel pump setup..........

[mercguy]

I have heard mixed feelings on installing a fuel pump on a Yamato 302. I see from the pictures that all (3) CSR's are running the fuel pump setup, so it must be working nicely. I see both the use of the smaller OMC fuel pump ad the larger ones being used. I have a setup I just picked up and want to hear the "mixed results" of the installation. It would be nice to get the gas tank weight off the top of the motor. How does the fuel pump setup affect the float level setting on the gravity feed Yamato carb, etc??

oops........I guess I should spell YAMATO correctly in the subject line............

[Racerkyle20]

I have heard mixed feelings on installing a fuel pump on a Yamato 302. I see from the pictures that all (3) CSR's are running the fuel pump setup, so it must be working nicely. I see both the use of the smaller OMC fuel pump ad the larger ones being used. I have a setup I just picked up and want to hear the "mixed results" of the installation. It would be nice to get the gas tank weight off the top of the motor. How does the fuel pump setup affect the float level setting on the gravity feed Yamato carb, etc??

Daren- Pat and I did this a couple of years ago. We had mixed results. We could not keep the flow of the fuel up the gravity feed, thus midway into the race i would spudder and eventually go dead or have half power. I think our problem was we gave up too early. I stil have the pump on the side of my motor. When it did run well. I thought the whole boat felt different. More stabllity bringing close to 5-10 lbs down from above the motor to below the block. I liked it, we just never could get it quite right though. I would like to try it again when i have time to test and have the pasence to toy with it. It's clearly working with guys back east, they've been doing it for years. Richard Runne, Pater, etc.

Kyle
20R

[B Walker]

From my experience its a control/handling issue, which definitely contributes to overall performance on the racecourse. CSR is tough enough to drive well without adding a higher center of gravity with that big gas tank on top of the motor. If you have a "long course extension" on it, just makes it worse. I noticed you dont see as many pump conversions in CSH.

Before and after dyno results were inconclusive. Theoretically, your lowering case pressure scince your scavenging to run the fuel pump. (which is bad)

We struggled with this until we got a fuel pressure regulator in the system....no probs after that, but cant remember who we got it from. With a pressure regulator float level is the same.

good luck,
Brad Walker

[spud62w]

302 Fuel Pump

If you talk to Backus 17W he can set you up. He's got a neat system with a pressure regulator on it.
Your on the right track to lower that tank

[jeff55v]

F.P. on Yamto

Hey Daren, maybe you missed this thread:

http://www.hydroracer.net/forums/showthread.php?t=10458

[mercguy]

Hey Daren, maybe you missed this thread:

http://www.hydroracer.net/forums/showthread.php?t=10458

you expect me to remember that info from almost a year ago???????

.........thanks Jeff!!! Don't have to worry about this issue with the Tohatsu!

[Trihedral_1]

I have heard mixed feelings on installing a fuel pump on a Yamato 302. I see from the pictures that all (3) CSR's are running the fuel pump setup, so it must be working nicely. I see both the use of the smaller OMC fuel pump ad the larger ones being used. I have a setup I just picked up and want to hear the "mixed results" of the installation. It would be nice to get the gas tank weight off the top of the motor. How does the fuel pump setup affect the float level setting on the gravity feed Yamato carb, etc??

oops........I guess I should spell YAMATO correctly in the subject line............

Daren-

I have the perfect, simple design, using the OMC pump, but no time to build it. How 'bout I give you & our buddy Guedo the plans and have a couple made. (then Everybody will want one)!

Give me a call or email.

Jimi O. (305-R/1-US)

[mercguy]

Daren-

I have the perfect, simple design, using the OMC pump, but no time to build it. How 'bout I give you & our buddy Guedo the plans and have a couple made. (then Everybody will want one)!

Give me a call or email.

Jimi O. (305-R/1-US)

Jimi, shoot me an email with your "plans" and I will submit it to my "fab shop" (me and my bro).............

mercguy@verizon.net

PS: how goes the 305-R (oops, I meant 1-US) rebuild????

[drbyrne55]

we'll sign up for one

Daren-

I have the perfect, simple design, using the OMC pump, but no time to build it. How 'bout I give you & our buddy Guedo the plans and have a couple made. (then Everybody will want one)!

Give me a call or email.

Jimi O. (305-R/1-US)

[mercguy]

we'll sign up for one

don't be a follower, be a leader............

[Fast Jack]

C fuel pump

Daren, I have used the omc pump from a 25 Hp, This combined with a by- pass fitting .( from Bob Dunlap) I have used this 4 seasons with no problems . No carb mods are necessary.

[reed28n]

Fuel System

The fuel system that most guys are using was developed by Dave Beiswenger from Fishers Landing NY, a retired fuel system engineer from GM. Rich Runne used this system for several seasons. There have been many other guys that have made them but I think Dave's system is the simpliest.

The fuel pump outlet pumps to a t fitting that includes a return to the tank. This return line has to be plumbed to a point equal to the height of your orginal motor mounted tank and you need to make sure that the system is well ventilated. The Fuel pump will pump more than a gravity feed tank so you need to relieve the over flow so you don't stick your float. That fancy block you see on the side of the mag is just an aluminum block drilled into a t fitting. It is very simple.

The one issue is introducing a fuel pump that can fail - into a system where the gravity always works with you motor mounted tank.

I have used this system since 1998 on my 302 and have missed two heats because of a fuel pump failure. I use the OMC A fuel pump, but I would recommend the Mikuni pump. They are cheaper to buy, cheaper to rebuild and a little simpler.

[mercguy]

got it!

OK, thanks for the info guys. I think I can make it work now. The OMC pump will be used, since the 302 has a provision already on the crankcase for it. Yamato HAD to have some knowledge of this, to have the 3 exact bosses cast into the crankcase, but not drilled or tapped.