WVO conversion problems

I am having some problems with my vegetable oil fuel conversion. I know that it is not one of your conversions, but I was hoping you could help me. The company I bought it from did not even return my phone call. Here are the issues: My system has an internal heat exchanger (transmission oil cooler type) put into the WVO tank. I had to cut a hole in the tank to install the heat exchanger. I keep having problems with fuel leaks around the flange of the heat exchanger. I have tried a couple different types of sealant. Vegetable still wants to seep out when it gets hot. Please help! Also when I take a long trip in my car it gets so hot in the trunk I can hardly put anything back there. I have also noticed moisture and scum forming inside the fuel tank and I am worried about this. I am having problems with hard crusting stuff forming on the tips of my fuel injectors. What do you clean them with? It is really tough stuff. When it builds up on the tips it really affects my fuel economy and gets harder to start. What can I do about this? Since you know Mercedes I thought I would ask for your advice. I really appreciate any help you can give me.

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