Garden

Experienced gardeners share their insights in answering this question :
Check the carb. float,needle valve and seat,could be stuck or missing?

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

One of the more common questions we get concerns either the overwhelming smell of gas coming from the carburetor or fuel leaking out of the bowl or overflow. Both conditions are typically caused by a stuck or worn float needle valve.
The air passes through a narrowed neck inside the carburettor (called a venturi ), which speeds up its flow at that point. As air flows faster its pressure drops, so there is a slight vacuum inside the venturi. The fuel jet opens into the venturi, and the partial vacuum sucks fuel through the jet into the air stream.
How is fuel drawn into the Venturi of a carburetor? The fuel is drawn into the carburetor by the vacuum created on the downstroke of the piston. As air accelerates through the Venturi, it creates a low pressure area and velocity of the intake air increases.
Let`s review some carburetor basics. Airflow through the carburetor venturi results in a pressure drop that draws fuel from the float chamber.
Pro Stock is still using carburetors where Top Fuel, Funny Car and many in the Pro Stock Motorcycle contingent are utilizing electronic or mechanical fuel injection.
If the pressure is too high, it can force too much fuel into the engine. That can cause fouled spark plugs, among other issues.
In a venturimeter, the losses are highly less, therefore, the coefficient of discharge is more whereas in an orifice meter the losses are a lot and therefore the coefficient of discharge cannot be much. The venturimeter can have more price of installation and replacement as compared to an orifice meter.
The venturi uses 0.9 hp for every three seconds of a 15-second cycle. Therefore, the venturi uses on average 0.18 hp of compressed air over the same cycle period.
Carburetors regulate the flow of air through their Main bore (Venturi), this flowing air draws in fuel and the mixture enters the engine via the intake valve.
Fuel Coming Out Overflow

Every carburetor is supposed to have overflow hoses so that if too much fuel is going into the carb it will come out of these hoses instead of flooding the engine. Any time you tip your dirt bike over, a little bit of gas will leak out the overflow, so that is nothing to worry about.

This is typically caused by one of two things. The most common being a bad fuel tank vent valve. This valve should open while fueling allowing the fuel vapor to be released to keep the fuel from backing up during fueling. It may also be a restriction in the fuel tank filler neck.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

1999 ford expiodition
ANSWER : Use a pressure gauge to check pressure at the rail. Change fuel filter. Replace fuel pump if needed.

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I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?
ANSWER :

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Why will my1994 bravada not start?
ANSWER : Very possible your new pump went out again, or was not installed correctly. Check fuel pressure. If you know electrical you can jumper the relay to run the pump. On some GM models I have seen a test wire for the pump underhood.

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Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.
ANSWER :

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Littlle giant pump model 2e-ndvr what oil goes inside this pump
ANSWER : “pump oil” usually is a fire redardant mineral type , ive seen good uses of dietary mineral oil avail at local phamacy , but is sort of pricey if filling a total pump up with it (allways allow for heat expansion)

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Sump pump hums and then kicks breaker. Will not pump. I cleaned everything, still have problem
ANSWER : Pump motor is jammed causing overload and resulting breaker trip. Try to turn the pump shaft by hand, it should be very easy to turn. If there’s any resistance check for blockage.

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Having problem getting fuel to carb on JD LA 105 lawn tractor with B&S 19.5 gas engine. I replaced fuel filter and fuel pump but gas will not flow to carb. Gas flows from filter to pump and I can pour gas in line to carb and engine will run until gas runs out of line but gas will not flow through pump. Could new pump be bad , if so how can I check it out?
ANSWER :

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I’am trying to locate the fuel pump on craftsman 19.5 hp lawntractor ( model # 944608450 ).
ANSWER : Hello, 944608450 is bad model #, however, it would be easier to find with the engine model number. Here are a couple of guesses: if it is the single cylinder engine with the fuel tank under the hood it has no fuel pump. Fuel is gravity fed. If it is the V-twin engine the fuel pump is a generally round black plastic mounted on the left side (as you sit on the seat) of the engine. There should be and in & out fuel line and a vacuum tube going to the valve cover. If it is the opposed twin then is is incorporated into the carb at the front of the engine. Hopefully this info will help otherwise, please get back to me with the correct tractor model and the engine model – type numbers. Please vote if this was helpful, thanks, Dean

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