Thread: Fuel filler cap D1

Originally Posted by poeee

I finally made the dive and am now a Land Rover owner. I picked up my 93 3 Door V8 Auto Disco last night. This will be the first of many questions, but I thought I would start with the basics.

The condition of the paint around the fuel filler tells me that it was possibly leaking at some stage, or still is. The cap just doesn't look like it's the right one. I think it should seal on the top of the fuel filler neck, but this is sealing (or not sealing, as the case may be!) on the rubber body seal. Here are some pics, could someone please confirm my suspicions?

Your correct the wrong cap

Ok I'll hunt for a correct one.

Any screw in cap from a 90s/early 2000s Ford Holden Mitsubishi etc should fit and seal correctly. They are darn near universal amongst Aussie production cars of the era. Just ask for one to fit a VT Commodore or similar.

Originally Posted by bee utey

Any screw in cap from a 90s/early 2000s Ford Holden Mitsubishi etc should fit and seal correctly. They are darn near universal amongst Aussie production cars of the era. Just ask for one to fit a VT Commodore or similar.

Excellent, thanks!

Just on that, what would be the problems associated with a dodgy/wrong cap?, appart from leaking, does the tank need to be pressurized to some extent, every car ive ever owned released pressure when I took the cap off except my Discovery, ill replace it If I have too if tank pressure serves a purpose in the fuel system

Sorry to hijack , kevin

Originally Posted by Kevin B

Just on that, what would be the problems associated with a dodgy/wrong cap?, appart from leaking, does the tank need to be pressurized to some extent, every car ive ever owned released pressure when I took the cap off except my Discovery, ill replace it If I have too if tank pressure serves a purpose in the fuel system

Sorry to hijack , kevin

Half of the D1 caps I meet don't hold pressure anymore. To test one, leave it off for a while to de-smell, then apply your mouth to the breather vent in the middle of the inside of the cap, and blow. A stuffed cap takes no effort to blow through.

When I do gas conversions with the gas filler in the fill hatch I have to chuck the oem cap anyway and fit a generic compact cap supplied with the kit. Fuel caps are a service item and wear out. Their job is to hold a small pressure to reduce fuel evaporation, i.e. reduce emissions of unburnt hydrocarbons, a major part of old time smog blankets in big cities. Saves wasting fuel too, and reduces the chance of water vapour entering the fuel tank.