Carb Engine Guru's
#12
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Join Date: Nov 2000
Location: Lake Charles, LA USA
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Ok try this. After your normal time between cranking the motors days/weeks whatever, before you touch the throttles or turn the starter, take off the flame arrestor and look into the carb. Push on the accelerator pump lever and see if any gas comes out of the accelerator pump nozzle in the top of the carb. Obviously if gas comes out the gas is not evaporating between outings.
I would try changing the plugs and setting the idle.
I would try changing the plugs and setting the idle.
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#13
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You'll need to pump the accel pump more than once - the pump holds one shot of gas in a closed area (at least on the stock weber I have), so the second shot will tell you if there is gas in the bowls.
I had the same issue as the OP. Gas evaporated after about a week or so of storage. I always had to crank a bit to start, but then the pump got weak and you could crank until the battery died with no gas coming forth (of course, I learned this on a ramp). Would not prime the pump when cranking. A little gas in the carb throats ran it fast enough to prime the pump. A new pump solved that, but I still have to crank 20 seconds or so after storage.
I had the same issue as the OP. Gas evaporated after about a week or so of storage. I always had to crank a bit to start, but then the pump got weak and you could crank until the battery died with no gas coming forth (of course, I learned this on a ramp). Would not prime the pump when cranking. A little gas in the carb throats ran it fast enough to prime the pump. A new pump solved that, but I still have to crank 20 seconds or so after storage.
#14
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Join Date: Aug 2005
Location: Concord, North Carolina
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I have a quick question about my carb engine..it's not really a problem, but was wondering if anyone else experiences this..
when starting my carb engine it takes me 5 or 6 different times turning the key before my engine kicks over, but once started it fires one time.. and this is with me pumping the throttles 5 or 6 times before each time i turn the key.....
carb is a holly 4150..when starting i do not use the manual choke, i just pump throttles a few times and turn the key..
again not experiencing any back firing or anything like that, boat runs great except for some tuning issues as far as idling characteristics under load under low rpms.
i'm do to have a compression test, and leak down test before the season, but was wondering if this is normal
thanks again,
Q
when starting my carb engine it takes me 5 or 6 different times turning the key before my engine kicks over, but once started it fires one time.. and this is with me pumping the throttles 5 or 6 times before each time i turn the key.....
carb is a holly 4150..when starting i do not use the manual choke, i just pump throttles a few times and turn the key..
again not experiencing any back firing or anything like that, boat runs great except for some tuning issues as far as idling characteristics under load under low rpms.
i'm do to have a compression test, and leak down test before the season, but was wondering if this is normal
thanks again,
Q
#15
Platinum Member
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Fix the choke. Dunno if you had an electric choke or a thermostatically operated one, but fix it. It's a cheap fix, and will make life easier.
If you have an electric fuel pump, your ground wire should be attached to an oil pressure switch. If so, you have to have oil pressure before the pump will run. If this is the case, then you can install a relay that connects to ground whenever the starter is engaged. This will start the pump a little earlier. I've even seen motors with a primer switch - instead of relay, you just run the ground thru a dash switch. Turn on the key (to provide + voltage to the pump), and thumb the primer switch to fill the float bowl. THEN pump the throttle a couple of times and fire it up.
Several ways to do it.
MC
If you have an electric fuel pump, your ground wire should be attached to an oil pressure switch. If so, you have to have oil pressure before the pump will run. If this is the case, then you can install a relay that connects to ground whenever the starter is engaged. This will start the pump a little earlier. I've even seen motors with a primer switch - instead of relay, you just run the ground thru a dash switch. Turn on the key (to provide + voltage to the pump), and thumb the primer switch to fill the float bowl. THEN pump the throttle a couple of times and fire it up.
Several ways to do it.
MC