This might be a stretch, but if the inlet pipe is protruding deep at all from the top of the tank, every inch extra will mean a loss of about 3.5 gallons of water in a 18x46x8 tank. Just a thought. But I sincerely doubt 6 gallons of sludge in the bottom.
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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