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Horizonjet

  • Karma: +0/-0
Carb PSI
« on: June 30, 2014, 10:12:54 pm »
I have a problem with stalling after running for 30 to 60 seconds at about half throttle. Changed a few things and woke up in the middle of the night thinking its running out of fuel.  Idles all day long and after it dies give it a few seconds and it would start back up, idle, and then go again for about 30+ seconds then die. idle all the way back to the dock.  I changed the fuel filter and moved fuel pressure guage where I can turn around and see it.  Ran much better almost without dieing but any more than half throttle and fuel pressure goes to 0 and then starts to sputter then I let up on throttle and fuel pressure climbes to about 2 to 3 and will run all the time, floor it again and pressure goes to 0 and does it all over again. Im thinking fuel pump. at idle it pumps 6psi all day but cant keep up when cruising, is it normal for the fuel pressure to go all the way to 0? I don't think it should and thinking of replacing electric pump with a carter p4070. Anyone use that one before? Or should I do Holley Red? right now im running what it came with and that's a facet noisy electric and dont really want to do that one again.or if there are any other suggestions/brands that may be better
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jamiemwedmore1234

  • Karma: +10/-0
Re: Carb PSI
« Reply #1 on: June 30, 2014, 10:25:39 pm »
Run a mechanical and run it for years trouble free and save $$


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ka0tyk

  • Karma: +30/-0
Re: Carb PSI
« Reply #2 on: June 30, 2014, 10:28:45 pm »
i will say having had both, the electrical is muuuch easier to fire the boat up after having it torn apart or sitting for a while.  but the mechanical just works and doesnt make any noise.  the electrical sounded like a rock crusher bolted directly to the stringer. 
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jamiemwedmore1234

  • Karma: +10/-0
Re: Carb PSI
« Reply #3 on: June 30, 2014, 10:51:11 pm »

i will say having had both, the electrical is muuuch easier to fire the boat up after having it torn apart or sitting for a while.  but the mechanical just works and doesnt make any noise.  the electrical sounded like a rock crusher bolted directly to the stringer.
true on easy starts but I've gone through more than one holly read leaving me stranded never with a mechanical either way they both wrk


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jamiemwedmore1234

  • Karma: +10/-0
Re: Carb PSI
« Reply #4 on: June 30, 2014, 10:51:55 pm »

true on easy starts but I've gone through more than one holly read leaving me stranded never with a mechanical either way they both wrk


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holley red typo


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Horizonjet

  • Karma: +0/-0
Re: Carb PSI
« Reply #5 on: July 01, 2014, 04:52:36 am »
The way the alternator is located I have no room for the mechanical or I would do that and prefer mechanical. Is the volley quieter? Fuel pressure should not go to 0 should it? It should be able to stay at the same I would think.
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Your Mom

  • Karma: +20/-0
Re: Carb PSI
« Reply #6 on: July 01, 2014, 07:07:03 am »
Run a line into a small carry on gas tank. You might have a clogged tank/filter/line. Your fuel pump might also be mounted to high as electric pumps push fuel not suck. You could flip your alt to the other side to get the clearance for the mechanical.  Also check your vents for the tank...
« Last Edit: July 01, 2014, 07:09:23 am by Your Mom »
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Horizonjet

  • Karma: +0/-0
Re: Carb PSI
« Reply #7 on: July 01, 2014, 07:53:35 am »
The boat came with the fuel pump the same level as the top of the tank. I changed the fuel filter and it ran better but still had problems with pressure. If I mount the electric fuel pump on the stringer by the engine will it be too far from the tank?
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Your Mom

  • Karma: +20/-0
Re: Carb PSI
« Reply #8 on: July 01, 2014, 07:59:39 am »
You could mount it there or on the back of your flywheel cover. I opened up my fuel line to 1/2" and the water fuel sep to 3/8 npt / -8. You might have debris in tank, pump to high or fuel vent clogged...

Horizonjet

  • Karma: +0/-0
Re: Carb PSI
« Reply #9 on: July 01, 2014, 03:03:58 pm »
I will have to check the tank. Ran fine the last 2 summers but that caint mean it was right
Did I mention I have a bow tank. That's not too far to put the pump in the rear of the boat?
« Last Edit: July 01, 2014, 06:24:59 pm by Horizonjet »
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86caribbean

  • Karma: +11/-0
Re: Carb PSI
« Reply #10 on: July 01, 2014, 06:30:06 pm »
I used to run a Holley blue pump in my boat and it too gave me some shit, it for no reason would just quit. Then after a few minutes it would pump fuel and I could fire up the engine again. I ditched it in favor for a Holley marine 130 gph mechanical and never looked back. Your fuel pressure should not change at any throttle %. With my mechanical punp and -6 line from each tank to the regulator in between the dual Holleys I have 6 psi always at any throttle position. Like some others said check for any kind of restriction in your fuel system, I also have seen a regulator do the same thing, cause fuel pressure drop. It's going to end up being something simple and stupid to fix.
  • Boat #1: 1986 18' Caribbean
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Horizonjet

  • Karma: +0/-0
Re: Carb PSI
« Reply #11 on: July 01, 2014, 08:23:40 pm »
Thanks for all the info. I'm sure its going to be something stupid. :)
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