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B&S Opposed Twin Fuel Problem

#1

P

Pillchuck

Ok I need help. I have a Briggs and Stratton 19.5hp opposed twin engine with fuel issues. I am able to start and keep the engine running as long as I poor gas down the carb. Therefore, it must be a fuel pump problem, however I have replaced the rebuilt the pump, and when that didn’t work I bought a brand new carb with pump on it. So that didn’t work and blamed it on maybe getting a bad carb/pump and returned it and got another one. Well same dang problem. I have tested the fuel line and fuel runs freely, I have opened up the carb and poured fuel into the bowl and it will until that gas runs out. I have tested the vacuum line and air is moving to the pump. What am I missing????


#2

ILENGINE

ILENGINE

Air leak in the fuel line between the pump and the tank, or maybe the pump is dry and not sealing well enough to create a vacuum to start the pumping process. Maybe try a fuel tank about the carb and see what happens and if it starts and runs that way then lower the tank to below the carb and see if it will keep pumping


#3

P

Pillchuck

Thanks!!! I will try these suggestions. I do have a shut off valve and a filter on the line so maybe one of these is leaking air. I will also try elevating the tank.


#4

oologahan

oologahan

Have you replaced the filter and its in line the right direction?


#5

Hammermechanicman

Hammermechanicman

Do you have the fuel and vacum pulse lines hooked up correctly? The pulse line goes on the bottom of the fuel pump and the fuel line goes on the side of the pump. Is it a 3 screw or 4 screw cover on the fuel pump.


#6

P

Pillchuck

oologahan said:
Have you replaced the filter and its in line the right direction?
Click to expand...
Yes I double checked. I’ve made that mistake before. The fuel flows in the line with no obstruction when not on the pump.


#7

P

Pillchuck

Hammermechanicman said:
Do you have the fuel and vacum pulse lines hooked up correctly? The pulse line goes on the bottom of the fuel pump and the fuel line goes on the side of the pump. Is it a 3 screw or 4 screw cover on the fuel pump.
Click to expand...
I have the four screw pump.


#8

B

bertsmobile1

The pump has a check valve in it , otherwise it could not work .
Thus fuel will only flow through it one way.
The inlet & the impulse are together, inlet in the side & impulse on the top.
The outlet is on the opposite side.
If the pump is Ok you should e able to suck fuel through it .
If you can not then the check valve is stuck.
They rarely ever cause any problems


#9

B

biggertv

Pillchuck said:
Ok I need help. I have a Briggs and Stratton 19.5hp opposed twin engine with fuel issues. I am able to start and keep the engine running as long as I poor gas down the carb. Therefore, it must be a fuel pump problem, however I have replaced the rebuilt the pump, and when that didn’t work I bought a brand new carb with pump on it. So that didn’t work and blamed it on maybe getting a bad carb/pump and returned it and got another one. Well same dang problem. I have tested the fuel line and fuel runs freely, I have opened up the carb and poured fuel into the bowl and it will until that gas runs out. I have tested the vacuum line and air is moving to the pump. What am I missing????
Click to expand...
Those pumps are trouble and always will be. Ethanol. Rebuild every season or else. Get an electric pump off amazone or fleabay (9.00) problem solved. leave other hoses hooked up, no problems, starts first time every time 18.5 brigs runs better than ever. Sorry, forgot how I hooked up electric, pump runs with key ON.


#10

R

rancher_mac

biggertv said:
Those pumps are trouble and always will be. Ethanol. Rebuild every season or else. Get an electric pump off amazone or fleabay (9.00) problem solved. leave other hoses hooked up, no problems, starts first time every time 18.5 brigs runs better than ever. Sorry, forgot how I hooked up electric, pump runs with key ON.
Click to expand...
Just came across this. I started a topic on the Briggs engine forum about installing an electric fuel pump. Did you go out the outlet from the electric pump through the inlet to the carb pump and just cap the pulse input?


#11

B

biggertv

rancher_mac said:
Just came across this. I started a topic on the Briggs engine forum about installing an electric fuel pump. Did you go out the outlet from the electric pump through the inlet to the carb pump and just cap the pulse input?
Click to expand...
From gas tank to Electric Pump to Fuel Inlet. Didn't cap Anything. No, gass does not flow to the pulse port. Apparently, design of the pump won't allow flow there. Oh and I used the Headlight Wires. To all the Purist out there: I used Wire Nuts on Power Lawn Equipment. I did Not measure Voltage, Amperage, Fuel pressure, Gallons per Minute or if approved by Federal, State or Local Gubberment. It Just Works. Stop fiddlin' with those POS stock fuel pumps. It will quit at the Back of the pasture every time. Good Luck!


#12

R

rancher_mac

biggertv said:
From gas tank to Electric Pump to Fuel Inlet. Didn't cap Anything. No, gass does not flow to the pulse port. Apparently, design of the pump won't allow flow there. Oh and I used the Headlight Wires. To all the Purist out there: I used Wire Nuts on Power Lawn Equipment. I did Not measure Voltage, Amperage, Fuel pressure, Gallons per Minute or if approved by Federal, State or Local Gubberment. It Just Works. Stop fiddlin' with those POS stock fuel pumps. It will quit at the Back of the pasture every time. Good Luck!
Click to expand...
Thanks for the info, I’m looking to move this direction. Probably put a pcv valve on the hose for the crank case pulse and cap the pump pulse inlet. I’m guessing your lights must run on dc power? Mine are AC so I’m going to probably tap into the ignition wiring. As you said, who cares about that approval junk. I talked with a local auto shop and the epa is trying to crack down on them for deleting the Active Fuel Management from GM rigs…even though it maybe saves 1mpg and by the time you replace the parts you’ve spent more than you saved on gas.


#13

M

mcspeed

Did the fuel pump solve the problem?


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