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1994 5.0 F-150 emissions delete issue

 
  #1  
Old 04-19-2019, 01:51 PM
grizzley30814
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1994 5.0 F-150 emissions delete issue

I did some search's but couldn't find what I needed so I figured it was time ask. We have a normal 94 F-150 5.0 with FI. We have removed most all the emissions, or disconnected them and the truck is running great no issues with that no stumbles or idling issues at all. Our issue is fuel being pushed out of the vapor/charcoal canister line into the engine bay and fumes then into the cab. We have tried to just capping the line but that resulted in the fuel tanks being pressurized. Fuel was being pushed out of the tanks at the fuel fill along with air pressure. The fuel caps are not vented since originally they would not have needed that. Pump is still in place but disconnected, ports on back of heads plugged

Is there something we missed in the delete of the system ?

Do we need vented gas caps and then seal off that line?

Any help would be appreciated, I am sure I missed something that is probably real simple but just don't see it.

Thanks in advance, James
 
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Old 04-19-2019, 02:22 PM
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Why did you remove the vapor canister? This device catches fuel vapors from the tanks so it can be put through the engine and used, there is no good reason to remove it.
If you have raw fuel in these lines you have 1 of 2 problems, either you are in the habit of overfilling the tank at the gas pump or the truck has dual tanks and one or both has defective check valves which allows fuel from the active tank to be returned to the other and over fill it... where it then gets pushed into the vapor collection system.
 
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Old 04-20-2019, 08:15 AM
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The vapor canister was filling with raw gas and it was leading to the fumes in the cab when driving or running the ac. Where are these check valves at ? hopefully not on top of the tanks????
 
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Old 04-20-2019, 09:30 AM
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The check valve is in the FDM. It's the Fuel pump basically.

As Subford mentioned, it's more than likely the check valve in the Fuel pump is bad. Have you had one tank filling the other or both doing it? Unless you overfill the fuel tanks every fill up, then I'm in agreement with Subford about the check valve being bad.
 

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