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11-16-2009, 08:00 PM
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#1
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Registered
Join Date: Mar 2009
Location: Muscle Shoals, AL
Posts: 30
35' Fountain Lightning
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Engine Dies when Throttle is APPLIED!
I was cruising at 3500 RPM the other day and my port engine began to lose rpms, so I brought both motors to idle then I turned engines off. I immediatly started the port engine and it started and idled fine, then I started the starboard engine and it started and idled fine. I put engines in gear and began to apply throttle and port engine would die. I turned both engines off and cranked the port engine only and it would crank and idle, but as soon as I tried to rev it up it would lose RPM or die. It sounds to me like its getting no fuel when throttle is applied.. ANYONE have any help or suggestions on where to begin.?!. BTW, it is a 1997 500HP Carb. engine!
Thanks
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11-16-2009, 09:38 PM
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#2
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Registered
Join Date: Sep 2009
Location: Hopewell, NJ
Posts: 33
24' Baja Outlaw
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First I would check to see if the accelerator pump is working and spraying fuel out of the squiters. With the flame arrestor off and the motor shut off look into the carb with a flashlight and have someone pump the throttle. You should see streams of fuel spraying in the carb. Next step would be taking the fuel bowls off and taking a look.
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11-16-2009, 11:50 PM
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#3
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Chris
 Platinum Member
Join Date: Sep 2005
Location: Snohomish, WA
Posts: 970
2009 Nordic Heat - 600sci - Whipple Stage VI - SCX drive
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Quote:
Originally Posted by OutlawMan
First I would check to see if the accelerator pump is working and spraying fuel out of the squiters. With the flame arrestor off and the motor shut off look into the carb with a flashlight and have someone pump the throttle. You should see streams of fuel spraying in the carb. Next step would be taking the fuel bowls off and taking a look.
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x2
You are running out of fuel on that engine.
Chris |
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11-17-2009, 12:03 AM
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#4
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Offshoreonly Advertiser
 Offshoreonly Advertiser
Join Date: Jan 2004
Location: Tennessee
Posts: 1,830
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First check or change the fuel filter if you haven't already. Next, if you don't have a fuel pressure gauge, get one hooked up...even if it's temporary. You may have a fuel pump going away. Let me know what you find and we will go from there. Good luck.
Eddie
__________________
True, Custom EFI and Carb. engines from 500 to 1500 HP. Also specializing in outdrive upgrades and repair, custom rigging and fabrication, we can handle all of your performance boating needs. See our entire engine line at www.YoungPerformanceMarine.com Contact us at 615-216-7449 or youngperformance@comcast.net
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11-17-2009, 01:18 AM
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#5
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Charter Member # 55
Charter Member
Join Date: Oct 2000
Location: Omaha
Posts: 8,355
32 Active Thunder
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Are they pulling fuel from the same tank or do they have separate fuel tanks???? I had a similar problem on my 525SC and it was water in the fuel.
It shouldn't be that hard to track down the problem. I agree, it sounnds like its running out of fuel. Usually a bad accelerator pump will just give a flat spot off idle and not make it die completely. Pull the flame arrestor and see what s going on. It could actually be flooding out because of a bad needle seat as well, but I would think you would have smelled the raw fuel.
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11-17-2009, 09:44 AM
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#6
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Registered
Join Date: Aug 2005
Location: Between A Womans Leggs IL
Posts: 442
1977 Donzi X18 434 hp sbc & 1992 Formula 336 SR1 x2 600 sc's
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Fixx
All of the above! If nothing else works check the fuel pick up's i had a similar problem in a customers boat,the pick up tube cracked at the threaded end that screwed into the 90 deg elbo where the fuel line slides on in the tank..ran fine on plane because all the fuel rush's to the back of the tank,then no fuel could be sucked up because of the cracked fuel tube..
If their alunimum replace both,the new design are plastic and wont crack..
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11-22-2009, 07:14 AM
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#7
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Registered
Join Date: Mar 2009
Location: Muscle Shoals, AL
Posts: 30
35' Fountain Lightning
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Took the flame arrestor off and pump throttle and no fuel is spraying...I DO have gas in the gas tank! NOw what???
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11-22-2009, 12:50 PM
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#8
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Registered
Join Date: Jan 2003
Location: Grand Rapids, MI
Posts: 983
30 Scarab Panther
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do you have the sea/fuel pump combo?
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11-22-2009, 02:31 PM
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#9
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Offshoreonly Advertiser
Offshoreonly Advertiser
Join Date: Jan 2004
Location: Tennessee
Posts: 1,830
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Quote:
Originally Posted by TubzzFormula 271
Took the flame arrestor off and pump throttle and no fuel is spraying...I DO have gas in the gas tank! NOw what???
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See my post #4
Eddie
__________________
True, Custom EFI and Carb. engines from 500 to 1500 HP. Also specializing in outdrive upgrades and repair, custom rigging and fabrication, we can handle all of your performance boating needs. See our entire engine line at www.YoungPerformanceMarine.com Contact us at 615-216-7449 or youngperformance@comcast.net
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11-22-2009, 03:10 PM
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#10
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Registered
Join Date: Sep 2009
Location: Hopewell, NJ
Posts: 33
24' Baja Outlaw
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Now verify if your fuel pressure is good and filling the fuel bowls. Then check the accelerator pump circuit.
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