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I recently had the need to drain my fuel tanks to make some changes to fuel pump set up on my 6 liter swap in my ‘74 XJ12.
I put new tanks in three years ago and have probably 1000 miles in the car in total driving with those tanks. And I was surprised how much sh*t was in them. I mean, it wasn’t visible while draining but still, I can see the benefits of draining the tanks now and again. I should note I cleaned and flushed the fuel lines and tanks before install so that’s stuff I couldn’t get out or stuff that got in over the past 3 years.
Doug's comment about dual filters is very wise, FYI here is a picture of mine in an S3. In addition, the stock filter is still in place down stream from the pump.
Dave
Last edited by LT1 jaguar; Aug 8, 2025 at 02:12 PM.
I recently had the need to drain my fuel tanks to make some changes to fuel pump set up on my 6 liter swap in my ‘74 XJ12.
I put new tanks in three years ago and have probably 1000 miles in the car in total driving with those tanks. And I was surprised how much sh*t was in them. I mean, it wasn’t visible while draining but still, I can see the benefits of draining the tanks now and again. I should note I cleaned and flushed the fuel lines and tanks before install so that’s stuff I couldn’t get out or stuff that got in over the past 3 years.
Probably stuff pumped in there from the gas pumps and stuff you couldn't get out, true. I cleaned mine the same, new tanks and rubber lines, cleaned carb flushed and blew out hard lines etc... Have a glass filter at the carb and have still dumped it out several times! Amazing. This wouldn't do for fuel injection components.
Fuel tank cleanliness (pic)
