Engine starves for fuel when going up hill.

Chocko · Nov 12, 2019

Hello, hopefully someone has had this problem as I'm at a loss at this point. Have a 1950 8N front distributor that stalls when going uphill at about anything more than a 10 degree incline.
Fuel tank, screens and line are clear with good flow. Engine runs perfect on level ground. When it stalls I can roll back to level ground and restart immediately. I have just installed a new
New Holland carburetor. Have re-checked float position. Any suggestions? Thanks.

Farmer Dan · Nov 12, 2019

It sure sounds like the floats are adjusted wrong. Remove the plug in the bottom of the carb and install a barb with clear hose on it. Make the hose form a U shape and hold it above the carb. When you turn the fuel on it will fill the bowl and the bottom of the hose showing you where the fuel level is in the bowl.

R Geiger · Nov 12, 2019

I would check your fuel flow while the tractor is on that 10 degree incline!

bjb in TX from Ne · Nov 12, 2019

A 10 degree slope is 17.5 % grade which is fairly significant. I have one of two theories:

1. The level of gas in a partial tank is lower than the inlet of the carb (or even the outlet of the tank) starving it for fuel, which is why other state to check the fuel flow while on the grade.

2. The filler on an 8N is in the back of the tank, when you are on that slope with a full tank, gas is against the filler cap (and the vent) and you are vapor locking the tank. This will also be apparent if you check the flow on the slope as well. You can also test this by checking to see if it stalls out downhill when the vent is not blocked.

The remedy may be to keep the tank full and figure out a way to vent the front of the tank.

HFJ · Nov 12, 2019

[i:6313adcde2]"The filler on an 8N is in the back of the tank, when you are on that slope with a full tank, gas is against the filler cap (and the vent) and you are vapor locking the tank."[/i:6313adcde2]

the vent in an N's gas tank is not the cap, unless someone has replaced the cap. it's here:

also, JMO, but i think the weight of the gas in a full tank would easily overcome any tiny amount of vacuum created in a short time. i believe vacuum-locking the fuel flow would be much more likely when the tank is low on gas as opposed to full.

Tomatoboy · Nov 12, 2019

Is the tank full when this happens? Half full? Nearly empty?

wayne bullen · Nov 12, 2019

That's what I was thinking. Do your fuel
tests with the tractor on the hill

Chocko · Nov 13, 2019

Thank you all for your input. Some additional information I didn't mention in my OP. The fuel tank is about 1/2 - 3/4 full, the tractor ran fine down the hill and I was able to back up the hill with no problem. Thanks again , I'll get to trouble shooting using your input.

Engine starves for fuel when going up hill.

Chocko

New User

Farmer Dan

Member

R Geiger

Well-known Member

bjb in TX from Ne

Member

HFJ

Well-known Member

Tomatoboy

Member

wayne bullen

Member

Chocko

New User

Similar threads