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russellm454
MMT Pro Member
Joined: Fri Nov 05, 2010 11:23 pm
Posts: 216
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 Adding Electric Fuel pump. Mikuni HSR42 3 Questions:
1.When adding a electric fuel pump do most people go directly to the carb and bypass the factory fuel pump?
2. Also do you regulate the fuel pressure?
I have a nice Mallory fuel pump and regulator from my old drag car that is just setting around. It will need to be regulated as it is likely 15 - 20 lbs un-regulated. What should the fuel pressure be set to. I'm guessing 4 - 6 lbs.
3. I have a HSR42 on my fatboy. I've thought about putting the stock carb back on the fatboy before I try to sell it and keeping the Mikuni. Will a HSR 42 from a Harley work on an otherwise stock 25hp Kohler with aftermarket or gutted exhaust? I'm thinking it may be too much carb for the 25 but I could still keep it in case I go to a 35 Kohler in the future. Thoughts?
Thanks,
Russ
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| Tue Aug 09, 2011 12:32 am |
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T-Bubba
MMT 1000 Club
Joined: Wed Feb 18, 2009 6:43 pm
Posts: 3958
Location: Centerville, La
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Re: Adding Electric Fuel pump. Mikuni HSR42
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I gave up mud motors
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| Tue Aug 09, 2011 12:51 am |
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deadbird8
MMT 1000 Club
Joined: Wed Feb 04, 2009 7:50 pm
Posts: 3833
Location: Old East Dallas, Texas
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Re: Adding Electric Fuel pump. Mikuni HSR42 or 1 to 2. This is a low pressure operation.
Or you can just guess, but make sure you hook it up straight the battery so you get lots of flow all the time.
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Excel 1851F4 w/ MB35HD+R CDI with a little bit of this and little bit of that
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| Tue Aug 09, 2011 7:34 pm |
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autogateman
MMT Sponsor
Joined: Thu Sep 16, 2010 10:32 pm
Posts: 4036
Location: Gonzales La
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Re: Adding Electric Fuel pump. Mikuni HSR42 mine is a 7 psi pump that i used a regulator to fine tune the pressure with. i found the ideal pressure to be at 4.5 psi.
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| Tue Aug 09, 2011 8:12 pm |
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russellm454
MMT Pro Member
Joined: Fri Nov 05, 2010 11:23 pm
Posts: 216
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Re: Adding Electric Fuel pump. Mikuni HSR42
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| Wed Aug 10, 2011 1:28 am |
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Chico80x
MMT Addict
Joined: Tue Aug 11, 2009 10:55 am
Posts: 743
Location: Ft. Lauderdale, FL
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Re: Adding Electric Fuel pump. Mikuni HSR42 I use a Facet cube and have been happy with it. It's only lost prime once and it was my fault.
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"We Are Products Of Our Decisions"
Gator Trax 1750HD With Mud Buddy Black Death 5500
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| Sun Aug 14, 2011 7:26 pm |
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Keith
MMT Pro Member
Joined: Thu Jul 28, 2011 2:56 pm
Posts: 60
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Re: Adding Electric Fuel pump. Mikuni HSR42 So should you bypass the factory fuel pump ?
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| Sun Aug 14, 2011 7:35 pm |
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Chico80x
MMT Addict
Joined: Tue Aug 11, 2009 10:55 am
Posts: 743
Location: Ft. Lauderdale, FL
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Re: Adding Electric Fuel pump. Mikuni HSR42 yes
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"We Are Products Of Our Decisions"
Gator Trax 1750HD With Mud Buddy Black Death 5500
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| Sun Aug 14, 2011 7:48 pm |
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garrettpearce
MMT 1000 Club
Joined: Mon Jul 27, 2009 8:10 pm
Posts: 1436
Location: down da bayou
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Re: Adding Electric Fuel pump. Mikuni HSR42 No
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| Sun Aug 14, 2011 8:05 pm |
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take'emgator
MMT Super Elite Member
Joined: Mon Oct 19, 2009 6:38 pm
Posts: 10201
Location: SETX
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Re: Adding Electric Fuel pump. Mikuni HSR42 YOu can run it through the factory fuel pump, incase your electric goes down you can still use the factory fuel pump to limp back to the ramp with you pumping the bulb
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| Sun Aug 14, 2011 8:09 pm |
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