fuel pump not

tkpjb · 11-27-2013, 10:47 PM

grandkids have an old yamaha g1. wouldnt fire up. pulled fuel line at carb, depressed accelerator. no fuel. crank case line has pressure (not sure what good pressure is, but has pressure).
So I bought a new fuel pump. same problem.
Put suction to line out on carb and pulled full, depressed accelerator, still no fuel pumping.
ANY IDEAS

85.G3 · 11-28-2013, 07:39 AM

Prime the pump to see if that helps. Unhook fuel line at carb and blow air into fuel tank till fuel comes out at carb line. Then crank to see if it pumps. A clear line at the carb helps to see if fuel is draining back thru pump, it should not.

copperhead1971 · 11-29-2013, 03:09 PM

check fuel filter and hose inside the tank to make sure it hasn't came off or rotted off as well...

tkpjb · 11-30-2013, 12:06 AM

blew air into tank through the line and could hear the gas bubbling

tkpjb · 11-30-2013, 12:10 AM

replaced fuel line and fuel filter. used a syringe to pull fuel at carburator. still didnt pump fuel

85.G3 · 11-30-2013, 09:32 AM

If fuel does not come out the carb line with air pressure in the tank check all fuel lines. Pull the pick up tube from the tank and check for leaks

tkpjb · 11-30-2013, 11:42 PM

85.g3
I can get fuel out of the carb when I pressurize the tank. But still not pumping fuel when I push accelerator.

dewzer · 12-01-2013, 06:39 AM

Quote:

Originally Posted by tkpjb

grandkids have an old yamaha g1. wouldnt fire up. pulled fuel line at carb, depressed accelerator. no fuel. crank case line has pressure (not sure what good pressure is, but has pressure).
So I bought a new fuel pump. same problem.
Put suction to line out on carb and pulled full, depressed accelerator, still no fuel pumping.
ANY IDEAS

Your stating the crank case tube has pressure.
It should not have pressure it should have a (pulse) pressure and suction.
Next on the list to check would be the lines hooked to the new fuel pump. Some new pumps have a different pulse line location. Most have arrows but not always. Is it a factory replacement or after market?
Can you post a picture of the new pump or a picture of how it is installed on your cart?
I have had a bad new pump in the past. Not that uncommon.
I just had a cart here and the pulse line was full of oil caused by the owner over filling the crank case. Once the new line was installed and the oil level corrected all was good.
Steve

tkpjb · 12-01-2013, 10:21 AM

Howdy Dewzer
crank is pulsing, pushing air.
replaced with like fuelpump.
crank line is clear and pulsing.
I will take pics and post.
The only thing I have not physically looked at is the line/tube on the inside of the tank.
thanks

85.G3 · 12-01-2013, 01:18 PM

Quote:

Originally Posted by tkpjb

85.g3
I can get fuel out of the carb when I pressurize the tank. But still not pumping fuel when I push accelerator.

Does the fuel flow back wards thru the pump when the tank pressure drops? If so the pump has a problem, a good pump acts as a check valve. I have had new pumps with diaphragm flaps missing

11-27-2013, 10:47 PM	#1
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8	fuel pump not grandkids have an old yamaha g1. wouldnt fire up. pulled fuel line at carb, depressed accelerator. no fuel. crank case line has pressure (not sure what good pressure is, but has pressure). So I bought a new fuel pump. same problem. Put suction to line out on carb and pulled full, depressed accelerator, still no fuel pumping. ANY IDEAS
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8

11-28-2013, 07:39 AM	#2
85.G3 Getting Wild Join Date: Mar 2013 Posts: 116	Re: fuel pump not Prime the pump to see if that helps. Unhook fuel line at carb and blow air into fuel tank till fuel comes out at carb line. Then crank to see if it pumps. A clear line at the carb helps to see if fuel is draining back thru pump, it should not.
85.G3 Getting Wild Join Date: Mar 2013 Posts: 116

11-29-2013, 03:09 PM	#3
copperhead1971 Not Yet Wild Join Date: Nov 2013 Location: Sarnia Ont Canada Area Posts: 56	Re: fuel pump not check fuel filter and hose inside the tank to make sure it hasn't came off or rotted off as well...

11-30-2013, 12:06 AM	#4
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8	Re: fuel pump not blew air into tank through the line and could hear the gas bubbling
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8

11-30-2013, 12:10 AM	#5
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8	Re: fuel pump not replaced fuel line and fuel filter. used a syringe to pull fuel at carburator. still didnt pump fuel
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8

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11-30-2013, 09:32 AM	#6
85.G3 Getting Wild Join Date: Mar 2013 Posts: 116	Re: fuel pump not If fuel does not come out the carb line with air pressure in the tank check all fuel lines. Pull the pick up tube from the tank and check for leaks
85.G3 Getting Wild Join Date: Mar 2013 Posts: 116

11-30-2013, 11:42 PM	#7
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8	Re: fuel pump not 85.g3 I can get fuel out of the carb when I pressurize the tank. But still not pumping fuel when I push accelerator.
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8

12-01-2013, 10:21 AM	#9
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8	Re: fuel pump not Howdy Dewzer crank is pulsing, pushing air. replaced with like fuelpump. crank line is clear and pulsing. I will take pics and post. The only thing I have not physically looked at is the line/tube on the inside of the tank. thanks
tkpjb Not Yet Wild Join Date: Nov 2013 Posts: 8

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