Purge Valve Cause Stalling?
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Purge Valve Cause Stalling?
I have an '82 F150 351W that had DS III/EEC III on it. Someone pulled the feedback carb off and put a simple one on, and then sold it 'cause it didn't run very well. Go figure.
The truck is 100 miles away from me, so I've been going up and working on it every week or so. With help from you'uns I've converted to DS II and have gotten it to run, but still need to connect or dispose of all the vacuum lines awa valves, solenoids, etc.
However, it only runs, albeit well, for a while. It'll idle seemingly forever, but once you start driving it'll go a few miles or to the first hill - whichever comes first. Then it runs out of gas, at the carb, and dies and won't start w/o ether - until quite some time later.
I just had a brainstorm - could the EEC, which I've not yet disconnected, be keeping the valve to the vapor canister closed? And, am I going to have to change out the purge valve with a vacuum-operated one as I do the smog system removal? Anyone have experience with this???
Gary
The truck is 100 miles away from me, so I've been going up and working on it every week or so. With help from you'uns I've converted to DS II and have gotten it to run, but still need to connect or dispose of all the vacuum lines awa valves, solenoids, etc.
However, it only runs, albeit well, for a while. It'll idle seemingly forever, but once you start driving it'll go a few miles or to the first hill - whichever comes first. Then it runs out of gas, at the carb, and dies and won't start w/o ether - until quite some time later.
I just had a brainstorm - could the EEC, which I've not yet disconnected, be keeping the valve to the vapor canister closed? And, am I going to have to change out the purge valve with a vacuum-operated one as I do the smog system removal? Anyone have experience with this???
Gary
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Joined: Jan 2001
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From: Virginia
All you have to do is make sure the line coming up the passenger side from the fuel tank going to the charcoal canister is open, so air can get into the tank when the fuel is pumped out.
Make sure the fuel lines are original, and the exhaust system is factory. If the exhaust gets near the fuel lines, it can overheat them and cause vapor lock.
Make sure the fuel lines are original, and the exhaust system is factory. If the exhaust gets near the fuel lines, it can overheat them and cause vapor lock.
Post Fiend
Joined: Jul 2004
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From: Northern California
Fresh air should enter the system through the bottom air holes in the charcoal canister itself for venting. The activated charcoal in the canister lets fresh air in, but blocks gasoline fumes from escaping. If the canister is not being purged of it's fumes, it could cause a vapor lock condition. A blocked or plugged vapor line from the tank to the canister can cause a simular condition.
Disconnect the vent line temporarilly from the canister that goes to the tank/s. That should let air into the system enough to test.
Disconnect the vent line temporarilly from the canister that goes to the tank/s. That should let air into the system enough to test.
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Looks like it is the fuel pump. There's gas in the tank, assuming it is pulling from the front tank, which is where the switch is set. I've replaced all the hoses in the line, and even pulled the cap off the tank when it stalled - to no avail. So, again, it must be the pump. Will replace it in a week or two - unless one of you have a better idea.
Gary
Gary
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