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tryan
MMT Member
Joined: Mon Aug 22, 2011 10:07 am Posts: 25
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Fuel pressure issue
Put a bps carb kit on my 23 vanguard. Replaced the fuel line, fuel pump, and tank. Now when I run wide open the engine will die after about 20 seconds unless I continuesly pump the fuel bulb. Running at 3/4 throttle and it runs no problem. HELP ME!!!!! Jet issue????
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Sat Dec 29, 2018 12:59 pm |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: Fuel pressure issue
It doesn't sound like a jet issue. Sounds like the fuel supply isn't keeping up. The factory smallblock pumps are pretty cheezy. 1/4 inch fuel line with no air leaks and tank close to engine is your best chance for the factory pump to keep up. The easy fix here is to add an electric lift pump. Oreillys has an eldebrock 2.5-3.5 psi pump that works well
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Sat Dec 29, 2018 1:07 pm |
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tryan
MMT Member
Joined: Mon Aug 22, 2011 10:07 am Posts: 25
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Re: Fuel pressure issue
Pulled the fuel line off of the carb from the fuel pump. Turned the motor on and gave it some throttle and no fuel came out of the hose. Suction issue?
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Sat Dec 29, 2018 1:19 pm |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: Fuel pressure issue
Put eyes on the tank fittings and hose. Exspecially if you have the grey EPA approved line with a liner. The liners love to collapse. Then buy a couple of factory fuel pumps. The smallblock ones are very cheap. Start with a fresh pump. Always keep a spare pump.
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Sun Dec 30, 2018 12:53 pm |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: Fuel pressure issue
I re read your first post, lol. Do u have your old pump to try?
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Sun Dec 30, 2018 12:56 pm |
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tryan
MMT Member
Joined: Mon Aug 22, 2011 10:07 am Posts: 25
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Re: Fuel pressure issue
Swapped out the grey fuel line with just your standard black rubber hose. Also put the old fuel pump back on. Disconnected the fuel line from the carb and spun the motor over. I got a huge improvement on fuel flow coming out of the black hose. Hopefully it’s fixed. I still have to test it on the water under a load. Thanks for your help guys.
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Wed Jan 02, 2019 5:50 pm |
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tryan
MMT Member
Joined: Mon Aug 22, 2011 10:07 am Posts: 25
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Re: Fuel pressure issue
Nope. Still broken. The only thing we can guess is the stock pulse fuel pump can’t keep up with the minimum carb demand. Any truth to this?
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Sat Jan 05, 2019 8:38 pm |
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aksmj
New Member
Joined: Sat Nov 15, 2014 10:03 am Posts: 1
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Re: Fuel pressure issue
I have the same motor and same parts from BPS. Having the exact same problem as you. I replaced the fuel filters, fuel line, shortened the fuel line, and the fitting to the tank. That didn’t help. Next step is a electric pump. I called Backwater Performance Systems and the guy I talked to made it seem like they’ve never heard of there being a fuel supply issue with the mikuni and the 23 Vanguard. I find that hard to believe. Did you end up getting yours sorted out?
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Tue Jan 15, 2019 9:24 am |
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huck Finn
MMT 1000 Club
Joined: Thu Jan 31, 2013 5:42 pm Posts: 1913 Location: Conroe tx
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Re: Fuel pressure issue
_________________ Ole black water keep on rolling
18x54 Uncle J -GTR - with the koolaid Back H2o SWOMP 23 SS stage 2 15x36 GD Duck Skiff GATOR GATOR GLIDE PROSTAFF BACKWATER PROSTAFF http://www.gatorglide.com
Coupe rest in peace brother
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Wed Jan 16, 2019 3:21 pm |
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tryan
MMT Member
Joined: Mon Aug 22, 2011 10:07 am Posts: 25
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Re: Fuel pressure issue
Aksmj- nope. Just dealt with it through duck season constantly squeezing the fuel line bulb. Once I get back from Afghanistan I’ll be adding an electric fuel pump. Edelbrock makes one that will work fine.
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Thu Apr 18, 2019 6:14 am |
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50fps
MMT 1000 Club
Joined: Tue Jan 13, 2009 6:42 pm Posts: 2377 Location: West Coast Wisconsin
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Re: Fuel pressure issue
I've never had an issue with the stock pumps that couldn't be fixed by finding the air leak and I've run every carb from the stocker to an S&S Super E on my motor.
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Thu Apr 18, 2019 7:21 am |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm Posts: 4820 Location: West Monroe, LA
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Re: Fuel pressure issue
The stock pumps are fine on the 35. On the 23, they leave something to be desired when spinning faster than 3600. The Facet posi flow (formerly the cube) is a very reliable and long lasting option, not stupid expensive.
#CFFITR #GhostBoat #Whoneedsphysicsihaveamudmotor
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Thu Apr 18, 2019 7:46 am |
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