Need help diagnosing this problem...
Thread Starter
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Mountain Pass
Joined: Nov 2019
Posts: 142
Likes: 0
Is the stock fuel pump on the truck or is an aftermarket elec one installed? If you have the stock style mech pump on the truck you won't be over-fueling.
Also, check to be sure the choke is fully coming off on hot engine, and closing on a cold engine.
It sounds like the carb just needs set up properly.
Also, check to be sure the choke is fully coming off on hot engine, and closing on a cold engine.
It sounds like the carb just needs set up properly.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
Well, then you won't be over fueling due to excessive fuel pressure.
Do you know how to adjust the idle air mixture ?
Do you know how to adjust the idle air mixture ?
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
No need to go through testing fuel pressure just look at the sight glass on the fuel bowl it the fuel level should be halfway up the sight glass. If it is too high you will need to adjust the float down. It's all part of setting up the carb.
Thread Starter
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Mountain Pass
Joined: Nov 2019
Posts: 142
Likes: 0
yes i know how to adjust the air fuel and fuel bowls. And yes you are correct that i do have a sight glass
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Thread Starter
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Mountain Pass
Joined: Nov 2019
Posts: 142
Likes: 0
so do you think this is strictly just an air fuel prob and dosnt have anything to do with timing or anything?
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
Sort the carb first as without that sorted everything else is guessing. And you are running rich so it is a fuel air issue. If the plugs are badly fouled they should be cleaned or replaced also...
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Measuring fuel pump output should always be done before setting up a carb or a tune-up. The reason is because if the output pressure is excessive, it will very quickly chew up the needle & seat and likely flood out, most likely at a bad time. I've wondered how many of those engine fires on YT are the result of crappy imported fuel pumps. One guy on another forum bought a fuel pump for a scrub motor, he said it measured 18 psi!!! The new manufacture pumps are suspect, just like everything else.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
Fuel pump pressure output is an important specification, and it doesn't have anything to do with the carburetor sight glass.
Measuring fuel pump output should always be done before setting up a carb. The reason is because if the output pressure is excessive, it will very quickly chew up the needle & seat and likely flood out, most likely at a bad time. I've wondered how many of those engine fires on YT are the result of crappy imported fuel pumps. One guy on another forum bought a fuel pump for a scrub motor, he said it measured 18 psi!!!
Measuring fuel pump output should always be done before setting up a carb. The reason is because if the output pressure is excessive, it will very quickly chew up the needle & seat and likely flood out, most likely at a bad time. I've wondered how many of those engine fires on YT are the result of crappy imported fuel pumps. One guy on another forum bought a fuel pump for a scrub motor, he said it measured 18 psi!!!
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta