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I've been running into issues filling up sometimes. Usually when the weather goes from cold-warm and vice versa. I thought taking my gas cap off and driving to the gas station solved it but my little 'trick' didn't work this today. What's happening is the filler-neck immediately fills up and then flows into the tank VERY slowly. Takes about 3 minutes to get a gallon in it.
Can't really work on my truck where I live so before I take it somewhere I can I thought I'd try to get some answers on what to do so I snapped a couple of pictures:
These are the vent and fill hose going to the filler-neck. All looks clean and clear.
This is a hose that looks like it comes out of the tank and is plugged for some reason. Wondering if I should remove the plug.
Hmm... Truck details? Filler and vent appear to be a truck equipped with a Evap system.
I would bet that second line coming from the tank is a capped off Evap which would cause a slow fill I would assume. I believe the vent lines on the fill side can collapse overtime.
Hmm... Truck details? Filler and vent appear to be a truck equipped with a Evap system.
I would bet that second line coming from the tank is a capped off Evap which would cause a slow fill I would assume. I believe the vent lines on the fill side can collapse overtime.
1978 F150 351M– I think the previous owner installed an aftermarket tank with what I think is the wrong sending-unit so it wouldn't be surprising if something else wasn't done to standard (fuel gauge reads just a bit over half when filled up).
Under the bed there is or should be a mount spot welded to the underside of the bed and the filler is hose clamped to it. That has to be on there or you will have problems. Sometimes the mount rots off, sometimes someone forgets to put hose clamp back on after working on it. Something to check.
1978 F150 351M– I think the previous owner installed an aftermarket tank with what I think is the wrong sending-unit so it wouldn't be surprising if something else wasn't done to standard (fuel gauge reads just a bit over half when filled up).
Mid-ship or aft axle fuel tank...or does your truck have both?
If your truck originally had Evaporative Emission (Evap/Em): Unleaded fuel, non vented fuel cap(s), vapor valve in the top of the tank(s).
Vapor lines route from valves along the inside of the right (passenger side) frame rail to the charcoal canister located in the engine compartment. 1978/79 canisters are rectangular plastic.
No Evap/Em: If your truck has a vent hose adjacent to the filler hose, originally it was taped to the filler hose. If not taped, the vent hose may collapse.
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Filling Gas Issues
