The solution I've seen is to run 2x19mm hose under the fuel-tank and bypass the hard pipes entirely.
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Beats dropping the tank.
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.
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.
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but you're doing that anyway! So maybe run the hoses above the tank? I'm not so sure about chopping out part of a hardline and creating an inaccessible joint above the tank
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- sounds like a bad idea to me.
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Just spitballing here, but I have been considering another idea on this too, although I'm unlikely to try it myself.
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For background, I'm currently thinking about a coolant system simplification when I reshell which would see me fitting a Davis Craig Electric Water Pump, removing the thermostat
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(because the EWP controls the flow
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/ temperature), teeing the heater matrix off the radiator at the front of the car and then using the heater pipes for my chargecooler pipework
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(plus a number of other things that aren't relevant to this post).
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Now, teeing both sides of the heater off the coolant rad makes no sense for a car with a thermostat because flow through the heater would be limited by the stat in exactly the opposite way to what you'd want.
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However it did make me think that you could tee the input to the heater matrix off the rad's input and send the matrix's output through the remaining good hardline
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(AFAIK only one pipe goes bad) and plumb that back into the engine as normal.
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I suspect it would have a slightly detrimental effect on heater performance, but might be a path of less even resistance than running pipework under the car.
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Well, other than the need to partially drain the main coolant system to avoid dropping about 5L of coolant into the frunk when you break into the radiator pipework.
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