[424]

Not sure that I fully understand the question...but let me try...you had a 1/4 tank, on the gauge, and put in approx 15 gallons to fill it up??? well, since 5 more gallons equals 1/4 of 20 then maybe your gauge is correct and you have a 20 gallon tank. I would assume the gauge is correct.

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JK
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[424]

Got it Steve...not trying to insult your intelligence...just want to hit the easy stuff first. I'm not sure if there is a code or someother identifying mark like a code...maybe someone else does. What makes you assume the gauge is incorrect again?

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JK
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78CJ5 258