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justinla
MMT Member
Joined: Mon Mar 02, 2009 3:58 pm
Posts: 8
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 Engine rpms dropping I have a Briggs 36hp PD, and while running full throttle (3850) the rpms will drop to 3600 then slowly recover and then drop again. If I pump my bulb it makes it run good for about 30 seconds.
What should I do?
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| Sun Sep 11, 2011 7:59 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: Engine rpms dropping Turn up your governor to 4200 OOW.
Is it cutting out and then you pump the primer bulb and it keeps running? Starving for fuel would cut out the motor, not drop the RPM slowly.
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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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| Sun Sep 11, 2011 3:03 pm |
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justinla
MMT Member
Joined: Mon Mar 02, 2009 3:58 pm
Posts: 8
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Re: Engine rpms dropping The rpms drop fast then recover slowly. If i pump bulb it recovers faster, and runs longer.
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| Mon Sep 12, 2011 10:37 am |
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BoatDR
MMT Sponsor
Joined: Tue May 24, 2011 6:43 am
Posts: 1604
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Re: Engine rpms dropping If you keep squeezing the bulb does it bog down or maintain running?
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| Mon Sep 12, 2011 10:40 am |
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justinla
MMT Member
Joined: Mon Mar 02, 2009 3:58 pm
Posts: 8
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Re: Engine rpms dropping if i continue squeezing it keeps running fine.
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| Mon Sep 12, 2011 1:45 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: Engine rpms dropping Probably have an air leak. That or your pump is bad, but more than likely just an air leak.
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| Mon Sep 12, 2011 2:16 pm |
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BoatDR
MMT Sponsor
Joined: Tue May 24, 2011 6:43 am
Posts: 1604
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Re: Engine rpms dropping
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| Mon Sep 12, 2011 7:34 pm |
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justinla
MMT Member
Joined: Mon Mar 02, 2009 3:58 pm
Posts: 8
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Re: Engine rpms dropping Thanks guys. I found one of my hose clamps really loose. I am hoping that's it.
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| Mon Sep 12, 2011 8:57 pm |
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Kelly
MMT Pro Member
Joined: Mon Jan 26, 2009 6:02 pm
Posts: 129
Location: Tiger Bend,LA
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Re: Engine rpms dropping Mine is doing the EXACT same thing. Put a new bulb, hose, check and rechecked connections. Mines an 08 so I'm gonna try replacing the little mech pump. But its doing exactly what yours is, no airbubbles though.
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...Dead Bird...B-A-C-K!
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| Thu Sep 15, 2011 1:33 pm |
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Kelly
MMT Pro Member
Joined: Mon Jan 26, 2009 6:02 pm
Posts: 129
Location: Tiger Bend,LA
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Re: Engine rpms dropping I may try going with the NAPA elect pump.
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...Dead Bird...B-A-C-K!
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| Thu Sep 15, 2011 1:34 pm |
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