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just purchased this 82 f100 which had a starting issue. had the carb professionally rebuilt. didnt take enough before pics and not sure what this vacuum line should go to.
also still doesnt start without pouring some gas in. is there a vacuum that keeps fuel to the carb or in the carb.
runs great once it starts
thanks for the help.
Last edited by givergas; Aug 1, 2020 at 05:41 PM.
Reason: Pics
Where does the hose for the p0ower brake booster get hooked to?
In the first picture it looks like it goes below the EGR valve and I cant think of a vacuum port under it that that hose would hook to.
You could also put a cap on it as that might be what was there?
As for the cold start issue.
That port needs to be closed off if the booster hose does not go to it.
In the pictures is the motor up to temp?
If not if you hit the throttle does the choke, the flapper thing on top, close?
If not it needs to and can be adjusted to do so and we can walk you thru that.
Also if this is your first motor with a carb there is a certain way you need to do things to start a carbed motor.
Press the throttle to the floor at least 1 time maybe 2 and hold it down just a little. This is needed to set (close) the choke and it gives a shot of gas just like you pouring a little down the carb.
Then see if it will start, let up on the throttle and see if it will keep running.
Dave ----
On my Bronco, that port on the driver's side rear hooked to the charcoal canister. It's to purge the canister when you are driving. I see you have the other evap hoses hooked up. The large one on the top front of the carb and then goes to a solenoid looking silver thing. That should have a ground and power wire to it. And then those large hoses lead down to the canister. Gas fumes from the carb go down those lines when the engine is cut off. You will have another line going to the canister from a line on the frame. That comes from the fuel tank(s). The canister stores these fumes, and then you should have some more gizmos and then a line leading up to that port on your carb, and it sucks the fumes in after the engine is warmed up.
And some engines do need a choke, even in 95 degree weather. Your lawnmower needs a choke in hot weather correct? And your weedeater also? Same thing. If you want to verify that is what is wrong, before you start cranking on it when it's cold, hit the gas pedal about 4 times to the floor before you crank it. Then crank it and see if it fires off. Each time you push the pedal to the floor, you are squirting fuel into the engine. It's like pouring it in there manually like you are doing now to get it started.
Do you still have the diagram sticker stuck to the radiator support? That should have where everything goes. Take a picture of that if it's still readable.
That port is the E port (emmsions port) for the EVAP system and the EGR. Looks like most of those 2 systems are disabled. Are you planning on using them? If not cap it off. if you want a simplified modified version let us know we and we can replumb the diagram for ya.
If you can keep the evap system hooked up I would. It really helps get rid of the gas smell when you park the vehicle. The dotted lines are all the fat lines that you still have hooked up that handle the fumes. The yellow lines are part of the purge for it, I rigged my purge using a long piece of one of the original small plastic vacuum lines they used. It purges at all times and seems to do the job, though I don't think it purges as aggressively as the original system did.
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