Author Topic: Fuel Pump???????  (Read 4665 times)

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Offline tjbryner

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Fuel Pump???????
« on: April 21, 2008, 03:31:11 pm »
I'm NEW to racing lawn mowers with that said. I tried to hook up a pulse fuel pump on a Briggs 15.5 ohv...I taped in to the Intake for the vacum....but it wants to load the carb up to the point it runs out the air filter?  :doh: I wanted to add the pulse fuel pump becuase at higher RPM's while going thru the coners (but not in a striaght line :bash:) it seems to break up as if it was running out of fuel :confused: any help would be great
The group I run with can be found at
www.freewebs.com/nlrc
I'm at work but I can post more Info tonight if needed.
Ps not sure if I put this in the right place.....sorry if I didn't

Offline George Herrin

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Re: Fuel Pump???????
« Reply #1 on: April 21, 2008, 03:40:07 pm »
You cannot simply add a pulse pump you must also add a pump seat. Gravity feed seat and pump seat are different.
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Offline tjbryner

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Re: Fuel Pump???????
« Reply #2 on: April 21, 2008, 03:43:07 pm »
You cannot simply add a pulse pump you must also add a pump seat. Gravity feed seat and pump seat are different.

Ok now I'm lost "seat"? what is the seat

Offline George Herrin

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Re: Fuel Pump???????
« Reply #3 on: April 21, 2008, 03:57:13 pm »
Its what the internal needle rests against to stop the flow of fuel when the bowl is full of gas....
George Herrin #6
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Offline tjbryner

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Re: Fuel Pump???????
« Reply #4 on: April 21, 2008, 04:04:09 pm »
 :bash: I wish I had know that SATARDAY........I was MAD....Oh well.. So All I have to do is get a seat for the carb and then I can run the pump. I'm guessing that the seat just screws in? And also Does any one think I'm right about running out of fuel at higher RPM"S and going in to the conners hard causeing a lack of fuel do to the gravity feed?

Offline George Herrin

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Re: Fuel Pump???????
« Reply #5 on: April 21, 2008, 04:22:36 pm »
Unless you vented you bowl externally which I am not going to get into how to details, you are flooding out going into the corners hard or even on a rough track since the access fuel dumps straight into the mouth/venturi in stock configuration.
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
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Offline tjbryner

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Re: Fuel Pump???????
« Reply #6 on: April 21, 2008, 05:49:15 pm »
Unless you vented you bowl externally which I am not going to get into how to details, you are flooding out going into the corners hard or even on a rough track since the access fuel dumps straight into the mouth/venturi in stock configuration.
Now that I'm home and not thinking so hard......It makes sense Is this covered somewhere in the forum? If so where would I look I've spent houras reading most of the post some of wich i've read more then ONE time....but reading is power:) And THz for all the help so far

Offline tjbryner

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Re: Fuel Pump???????
« Reply #7 on: April 21, 2008, 07:37:28 pm »
well Iordered a new seat for the carb but still worried aboutthe venting? Not sure if I can do it or not but time and probally a few mess up later I might get it .......OR I'll be sending it out west to g-team, But I've got to try. To me thats the best part about the build figureing every thing out!

Offline nor66

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Re: Fuel Pump???????
« Reply #8 on: April 21, 2008, 09:54:22 pm »
EC also does some awesome carb work
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Offline tjbryner

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Re: Fuel Pump???????
« Reply #9 on: April 22, 2008, 06:55:52 pm »
Ok got th new seat so I can run my fuel pump .....To get the old seat out do i have to Drill it out? Or am i not looking at it right

Offline George Herrin

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Re: Fuel Pump???????
« Reply #10 on: April 22, 2008, 11:40:37 pm »
use a 1/4 " tap tap it  run a long 1/4 bolt in then with a vice pull seat out the press new seat in.
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
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www.herrinmowersports.yolasite.com
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My other racer is a 1/5th scale Dirt Late Model!!!!

Offline tjbryner

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Re: Fuel Pump???????
« Reply #11 on: April 23, 2008, 07:55:36 am »
Thanks for the help George  I think I got the whole vent thing figured out in my head. Tonight I'm going to give it a shot........I'm glad I have 8 more carbs in the shop :lol: just in case i screw up a few times. the only thing i'm worried about with the vent .....fuel spillage or do you guys run a tube to a catch can? thats the only part yet that i'm not sure how I'm going to do.

Offline George Herrin

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Re: Fuel Pump???????
« Reply #12 on: April 23, 2008, 08:15:40 am »
I run a tube down under the frame
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
8 time ARMA National Champion
4 time USLMRA National Champion
Retired from BP
www.herrinmowersports.yolasite.com
www.allamericanmowerchampionships.yolasite.com
My other racer is a 1/5th scale Dirt Late Model!!!!

Offline tjbryner

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Re: Fuel Pump???????
« Reply #13 on: April 23, 2008, 09:41:40 am »
I think I'm going to make a small nipple like the size of grease fitting and run tubing down to my catch can.....well again I thanks George for your help. Wish I had half your knowledge.