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Garden Tractors Discussion Forum

no fuel

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bdunegan

02-15-2005 18:07:03




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i have an 18hp b&s twin cylinder with the fuel pump on the front of the carb. one hose goes to the block for vacuum, the other to the fuel tank. engine ran fine until it starved for gas and quit. rebuilt fuel pump, but still not pulling fuel to carb. put all new fuel line and vacuum line on, but i dont think it is getting any vacuum from block. vacuum fitting just screws into block, and i cant see any kind of plate around it that comes off to check anything. anyone ever had this problem, and how do i fix it? runs fine as long as you fill carb with fuel, then runs dry and dies HELP PLEASE!

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Hermit

02-17-2005 18:30:42




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
Sounds to me like the diaphragm in the crankcase oil breather is not seating properly, maybe due to a little bit of dirt or some gummy oil. If this diaphragm doesn't seat, air will move through this opening and won't allow enough pressure/vacuum in the crankcase to move the fuel pump diaphragm. I believe it's to the right and slightly below the fuel pump. Remove it, clean it, re-install it and it should work. Good luck.

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deanop

02-16-2005 18:53:33




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
don't know if this is a good practice but sometimes i've pressurized the fuel tank with low air pressure but cutting the valve stem and part of an innertube covering fuel tank..you could try this carefully and see if you can get fuel running/primed...BEFORE this though like one man said about having lines reversed, that has happened to me, easy to do..the diaphram also seems like a good possability!

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JT

02-16-2005 06:33:55




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
Do you have a good supply of fuel from the tank? Did you crack the fitting on the vacumn line, we used to sell a lot of pump bodies when that engine was popular. Are all the little springs in place on the diaphram?



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bdunegan

02-16-2005 07:11:20




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 Re: no fuel in reply to JT, 02-16-2005 06:33:55  
the tank is full of fuel, but it is not pulling enough vacuum to even fill the fuel line. all springs are in place as original. can pull top of carb and fill fuel bowl and engine runs great until bowl runs dry. needle is not sticking. havent tried pulling spark plugs and spinning engine yet, but i will.



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JT

02-16-2005 11:04:06




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 Re: no fuel in reply to bdunegan, 02-16-2005 07:11:20  
OK, lets try this, take off fuel line and put your finger over fuel port on carb, turn over and see if it is drawing anything. You might try taking off fuel cap and blowing in tank and see if you can get fuel to pump that way. Are you getting any vacumn at the fitting on carb from engine? If you have a dipstick o-ring or something leaking, you will loose crankcase vacumn and henceforth, no fuel.

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Kent of SW MO

02-16-2005 06:07:55




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
Be sure you have the fuel line on the fuel port and the vacuum line on the vacuum port on the carb/fuel pump assy. I have been there and done that.

Kent



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Bob - MI

02-16-2005 05:56:00




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
I have a 20hp B&S that I bought new and had the same problem with. I cranked it forever and it wouldn"t draw fuel. I also took the pump apart and inspected it for holes in the diaphram. Put it back together and finally got it primed up and off she went. Never did figure it out but it has never failed to prime after that.

Try taking the plugs out and cranking. The pump is driven off the crankcase pulse so it will pulse much faster and reduce the wear on the starter. If this fails I would look for a hole in the pulse line and make sure the connections are good. Also make sure the in-line filter isn"t clogged.

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oldrustycars

02-15-2005 19:01:46




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
if its the pump im thinking of, its real easy to get the diaphragms backwards when you rebuilt it. also be sure there isnt something blocking the tank. trash can float around in the fuel til you run it out, then it gets sucked into the line.



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bdunegan

02-16-2005 05:35:18




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 Re: no fuel in reply to oldrustycars, 02-15-2005 19:01:46  
the pump is the rectangle one with three screws. the diaphragm will only go in one way, or else the round fuel chamber would be on the wrong side. has all new fuel line from the tank, and tank was cleaned. carb was also rebuilt to factory specs. any other ideas that might help?



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John McPherson

02-16-2005 07:42:13




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 Re: no fuel in reply to bdunegan, 02-16-2005 05:35:18  
is there a filter screen in the fitting that screws into the bulkead bung of the fuel tank? It may have gotten clogged.

If fuel is able to flow, did you remember the tiny little springs that are supposed to go behind the little flap valves- did they stay in place as you tightened the pump bodies together?

Worst case is to get one of the new disposable pumps.



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deanop

02-15-2005 18:55:51




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 Re: no fuel in reply to bdunegan, 02-15-2005 18:07:03  
i don't know anything about your engine, except i had a snowmobile with an impulse?, fuel pump that draws vacuum, and one possible symptom is the carb itself...does it spit gas when you disconnect fuel line to carb...i would start at the beginning..are you gettin fuel to fuel pump..are all fuel lines in good shape and not pinched. clogged fuel filter..on my snowmobile, i found rust in gas tank, and fuel filter were main culpret...also you should be able to do an air test to test for air leakage in the fuel pump itself..also, my manual mentioned loss of wave motion pressure in the crankcase (i'll be darned if i even know what that means...)..i'd be willing to bet you've got leakeage/and or pluggage somewhere in there...good luck, and hopefully someone with more brains than i can help ya.....

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bdunegan

02-18-2005 10:04:17




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 Re: no fuel in reply to deanop, 02-15-2005 18:55:51  
thanks for all the help. i hooked the lines up opposite to what i thought was right. motor turned over three times and runs like a champ. now fuel line goes in to side of pump, and vacuum goes in to bottom of pump. this is exactly opposite to what it was. if i am correct, vacuum line goes in to the large round diaphragm port, and fuel goes to the port with the two small springs and flappers correct? if this is the case, then mine is backwards, but what the heck, it runs.

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