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| PD 36 surging http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=3624 |
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| Author: | Mallards Only [ Sun Aug 02, 2009 8:14 am ] |
| Post subject: | PD 36 surging |
Hope it's OK to post this on this forum. Yesterday, while running my PD, the engine started surging at high RPMs(only above 3800). Motor was trimmed where I normally run it and it's never done this before as long as I've had a load on it. Only has about 50 hours on it. Plan to call KP tomorrow but maybe it's something stupid that I can check first. |
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| Author: | DeathMetalDukk [ Sun Aug 02, 2009 9:01 am ] |
| Post subject: | Re: PD 36 surging |
Sounds like ya sucked up some bugturd in the carb. Surges when it runs out of fuel, then chokes itself to stay goin, or at least that's what mine was doing. |
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| Author: | deadbird8 [ Sun Aug 02, 2009 10:29 am ] |
| Post subject: | Re: PD 36 surging |
If you have a primer bulb on it, pump it when it starts happening and see if its fuel starvation. (i.e. only happens at high RPM) |
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| Author: | Mallards Only [ Sun Aug 02, 2009 2:02 pm ] |
| Post subject: | Re: PD 36 surging |
I'll try that. If that temporarily solves the problem, what's the best fix? |
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| Author: | mudd [ Sun Aug 02, 2009 3:06 pm ] |
| Post subject: | Re: PD 36 surging |
xgen just had it happen and ended up needing a 2-3 psi lift pump |
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| Author: | deadbird8 [ Sun Aug 02, 2009 3:30 pm ] |
| Post subject: | Re: PD 36 surging |
| Author: | Mallards Only [ Sun Aug 02, 2009 4:14 pm ] |
| Post subject: | Re: PD 36 surging |
| Author: | XGEN-DUCKMAN [ Sun Aug 02, 2009 6:03 pm ] |
| Post subject: | Re: PD 36 surging |
I was being told it was bad engineering (Briggs), vapor lock of some sort  , some need the xtra pump some don't............all I do know is that the pump fixed it and it is now running like a champ...............call PD they have the pumps ya need if ya need it...............check all your lines and tank connections also, could be a small air leak...........
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| Author: | deadbird8 [ Sun Aug 02, 2009 6:44 pm ] |
| Post subject: | Re: PD 36 surging |
| Author: | Mallards Only [ Sun Aug 02, 2009 9:07 pm ] |
| Post subject: | Re: PD 36 surging |
Really? I've run it in warm weather before without issues. |
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| Author: | dead animal [ Sun Aug 02, 2009 9:25 pm ] |
| Post subject: | Re: PD 36 surging |
if u put on a vacume fuel pump instead of the pos cam driven stock pump u will solve the problem without having to deal wif a elec fuel pump. 
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| Author: | Mallards Only [ Mon Aug 03, 2009 7:43 am ] |
| Post subject: | Re: PD 36 surging |
| Author: | LA OUTLAW [ Mon Aug 03, 2009 10:12 am ] |
| Post subject: | Re: PD 36 surging |
Get the e-pump and get rid of the priming bulb.....problem solved |
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| Author: | deadbird8 [ Mon Aug 03, 2009 10:27 am ] |
| Post subject: | Re: PD 36 surging |
| Author: | LA OUTLAW [ Tue Aug 04, 2009 8:25 pm ] |
| Post subject: | Re: PD 36 surging |
| Author: | oneneo3 [ Wed Aug 05, 2009 11:53 am ] |
| Post subject: | Re: PD 36 surging |
| Author: | Brinkleydog [ Wed Aug 05, 2009 3:40 pm ] |
| Post subject: | Re: PD 36 surging |
http://www.mikuni.com/fs-carburetor.html DA is this what you where talking about?????? |
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| Author: | schrieverboy [ Wed Aug 05, 2009 3:59 pm ] |
| Post subject: | Re: PD 36 surging |
briggs has alot of problems wit der coils(this is comming from a briggs mec.) when u run it for a long tiime the coil begins to heat up and stops thrown fire like it should.. itll start running like sh!t and ya rpms willl drop like it aint got fuel.. they can actually troubleshoot the coil n see if thats ya problem |
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| Author: | Quackpipe [ Sun Aug 16, 2009 12:22 am ] |
| Post subject: | Re: PD 36 surging |
Just another 2 cents +/- a cent. I had this problem with my PD 36. Switched to all straight fittings,good hose, good pumpbulb,good filter,good connections and clamps,no kinked hoses. Turns out, I have one of those high dollar metal fuel tanks, the kind you can run accross if a snake was to drop off in the boat,AGAIN.  Anyhow, when I twisted the vent open(counter clockwise)I was turning it to far counterclockwise,which would choke the vent,just as if I close it(clockwise).TURN VENT COUNTERCLOCKWISE HALFWAY FOR FULL VENT, at least on the metal tanks.  Runs fine now.
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| Author: | POKER1 [ Sun Aug 16, 2009 1:23 am ] |
| Post subject: | Re: PD 36 surging |
I changed an inline filter out once and had nothing but problems till I put a second filter on. I had bought 2. Something was wrong with a brand new filter. These things can be finicky for sure. |
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