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Username Post: 1951 3100 Stalling on hill        (Topic#357276)
Posts: 2

Reg: 07-18-19
07-18-19 11:40 AM - Post#2770993    

I have a 1951 3100 with a 216. I have had it for about 1 1/2 years, and drove it app. once a week all last summer (stored during winter) with no problems. It is now stalling if going up any considerable grade hill.
I first thought it was vapor lock, as it has been quite hot. I put insulation sleeve on all of the fuel lines, changed the fuel pump and fuel filter (just in case), and even used the old clothes pin trick. It is still doing the same thing.
It seems to be OK on flat terrain.
I have not been able to get the truck home since this first happened because I live on the top of a hill on all approaches to my home, and have been working on it at my brother's garage.
I would appreciate any thoughts as to what could be causing this.


"14th Year" Silver Supporting Member
Posts: 981
Loc: San Marcos CA USA
Reg: 06-04-01
07-19-19 10:01 AM - Post#2771074    
    In response to jmart56

My first thoughts are Carburetor float, stuck, maybe too low?

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"15th Year" Platinum Supporting Member
Posts: 3247
Loc: So Cal
Reg: 06-07-05
07-19-19 03:48 PM - Post#2771094    
    In response to HotRodg57

sounds fuel starve related to me...

-have enough fuel in the tank for the hill?
-fuel pump pumping it to the carb when cranking?
-carb working as it should? (like Rodger the float stuck)?

57 Nomad -LS1 with C4 suspension
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Posts: 227
Loc: Northern Indiana
Reg: 04-02-16
07-20-19 09:09 PM - Post#2771194    
    In response to WagonCrazy

Did you try the carb cleaner vacuum leak thing?

Posts: 2

Reg: 07-18-19
07-22-19 04:34 PM - Post#2771332    
    In response to Mick53

I have since removed the carburetor (Rochester) and gave it a good cleaning, and made sure that the float was moving freely. There was a little sediment at the bottom of the bowl.
I replaced the carb, and it started with no problem and I let it idle for about 3 minutes; I then drove it on level streets for about 1 1/2 mile, stopping at stop signs and traffic signals - no problem. I then made another try at the hill. It took it like a champ with no problem. To my dismay, however, upon stopping at a stop sign about a 1/4 mile after cresting the hill and on level roadway, it stalled.
It started, and I drove it another 1/4 mile to my driveway, and stalled as I was turning in. It continued to stall if I let up on the accelerator and went to idle.
I believe the problem must be in carburetor float somehow, and I will attack the problem from that angle. The fact that it climbed that hill was a mini victory.

Valued Contributor
Posts: 3880

Loc: Eagan MN
Reg: 06-02-03
08-12-19 03:42 PM - Post#2773072    
    In response to jmart56

A couple other things to consider... a dirty fuel pick up screen inside the tank; a dirty fuel filter.
I experienced the first one, a lot of rusty debris in the bottom of the tank. What would happen is the debris would settle to the bottom allowing gas pass the screen. Once running and in motion the debris would stir up and with-in a mile or two would plug the screen. Once stopped, fuel pump stopped sucking and the debris would fall away to the bottom of the tank. Truck would restart and the cycle repeats.

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