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How does the hot-dipped zinc coating react with the fuel?

We make oil tanks for vehicle companies. In a new program, I find a question.Our customer thought that zinc coating steel sheet is not acceptable for producing oil tanks, because they consider that zinc will easily corrode to form a high volume ,white corrosion product, and it will plug fuel filters.But as I know ,there are already many zinc coating oil tanks in use in vehicle market.Why don't they point out this question.But in my opinion, that zinc will be oxided easily is reasonable.So, is the zinc coating oxided by the remnant oxygen or by the oil in the tank? It is clear, there are Sulfur and phosphorus in the oil, either benzine or diesel oil, in despite of small content.
Is there anyone who knows some information about this, and knows how zinc oxide products(maybe it is not zinc oxide,s omething else).
I will be very appreciative.
Thank you!
By the way, when we use terne coated steel sheets, no problem happens.Puzzled!

Sterntaler Yang
an engineer - Shiyan, Hubei, China
2006