carb ?
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From: junction city or
carb ?
i just picked up a 1974 4x4 f100 . my question is the carb has problems and as i was looking at it is on the top of the carb there looks to be a fuel return fitting on top but no return line to the tank is this the right carb or is there supota to be a return line
thanx paul
thanx paul
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From: junction city or
does the evap. fitting look like there should be a hose attched to it and its right on top of the bowl. any way the problem im having is when the truck sets for an hour or two it seems like its out of fuel i have to crank it over several times before it will pick up fuel
paul
paul
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If you slightly press a release the throttle just before you try to start it does it help?
Your either looking at the bowl vent usually pointing straight up or the connection of the vapor recovery system which is not necessary for the carb to function properly.
Your either looking at the bowl vent usually pointing straight up or the connection of the vapor recovery system which is not necessary for the carb to function properly.
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Elder User
Joined: Dec 2007
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Times like this I wish a photo is possible. Other thing it might be, and this I know applies for most 2100 series. Located right above and at about the 11 o-clock position as looking 'down' at the carb...the 2100 series that has a exhaust choke heater--and it has a 'clean air' port right at the back of the air-horn. Looks about 3/16" or so in dia. Points downward at about a 45 degree angle. This of course is no where near the float bowl on that model, so it may not apply. If the carb has this exact "port" and at some point in time someone did an electric choke conversion? That port can be plugged/capped. It won't have any effect on the fuel however--but it's worth a mention.
See if anyone has a camera that can take a few pic's of this carb...once we see it? We should be able to better figure out what it is--and what's going on with it.
S-
See if anyone has a camera that can take a few pic's of this carb...once we see it? We should be able to better figure out what it is--and what's going on with it.
S-
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From: Gadsden Purchase
Mine always started better when the bowl was full too, so...
I added an electric fuel pump (6 volt Bendix) down next-to
the fuel tank switching relay-valve.
Since I don't believe in window washers I hooked the fuel pump
up to that momentary switch.
I'm still using the original 2100 carburetor.
YMMV :)
Sounds to me like you just need to adjust your carburetor.
And the "reman carb" isn't exactly like the one that came off it.
Alvin in AZ
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I've caught hell for saying this before. To restart the vehicle easily there must be vapors in the intake plenum to draw into the cylinders. Todays fuel have alot more additives and alcohol blends in them (ARCO as much as 20%). This can cause the gas to evaporate at a faster rate over time (especially in a hot intake) leaving it empty. When you leave your truck sit for an hour or two this can happen and a few weeks can vapor an entire fuel bowl. If you press and release the throttle slightly first it will ease the starting process.
There could be the opposite, but doubtful. The fuel bowl is draining into the intake and is empty by the time you get back. This would typically cause flooding and a hard start as well, but pressing the throttle and holding to the floor will ease the starting process.
The part I caught hell for was fuel doesn't evaporate. Fill a one gallon can leave all the ports open and see how long it takes to vapor out.
Tedybear is right, I have seen this cleanair port before.
Alvins Idea of the elec pump was great, especially if you only drive the vehic part time.
There could be the opposite, but doubtful. The fuel bowl is draining into the intake and is empty by the time you get back. This would typically cause flooding and a hard start as well, but pressing the throttle and holding to the floor will ease the starting process.
The part I caught hell for was fuel doesn't evaporate. Fill a one gallon can leave all the ports open and see how long it takes to vapor out.
Tedybear is right, I have seen this cleanair port before.
Alvins Idea of the elec pump was great, especially if you only drive the vehic part time.