What type of fuel primer pump does your car have ?
Push type or Twist type
I've heard that the newer Push Type Primer pump doesn't like Vegi and will fail . So maybe due to the Filter's and temp you suffered from fuel starvation and then after you switched the Filter you just can't get it primed to start again. I know I've had some trouble getting mine to restart after Filter change out. Just seems like it can take a long while to get a good plug of fuel flowing again so they will start. Doesn't occur each and every time but I've seen it. Just an Idea.
But your right you need to get a 2 tank heated system it will help. I've been running for 3 years on a homemade system.
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Eric in Plano,Tx
85 300D 277K overall miles
65K on WVO (2 tank) 
Rebuilt Transmission at 245k miles.
96 CE LT1
94 Nissian Hardbody
96 F250 XLT PowerStroke (also runs on WVO)
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