It seems as if there are two issues here. One is that the fill pipe is corroded, and the other is the location of the tank. Since you had a discussion about the tank, the inspector didn't "miss" this, they just have a different opinion of what is "safe" than the oil company does.
All the best,
When applying for an FHA Insured Mortgage, HUD and we Lenders strongly recommend a consumer get a home inspection. The reason? Lack of home inspections can lead to foreclosures! The homeowner who can't heat the home due to a bad oil tank---or fill pipe---may not be able to pay the mortgage since the repair of such an item is expensive.
In your case the inspection was faulty, and IMHO, this is a serious defect that you should pursue so as to send a message to this inspector.
First, the inspector probably has a "limited liability" clause in the inspection report. I don't care if he does: if you can afford a good, nasty, Attorney, then you should have that attorney sue this inspector for your damages, liability clause be damned. So soon after closing? Oh no. Obvious damage that should have been picked up by the inspector? No, no, no.
Second, you need to notify whoever referred the inspector to you, or, if you found the inspector on your own, file a complaint with the local Better Business Bureau and/or Consumer Agency.
I don't know about Maryland, but here in New York the home inspectors must be licensed; but so are hair dressers and hot dog vendors. We still encounter shoddy inspections even with what should be an important consumer protection built in.
I can only offer you encouragement to pursue the legal actions and not to give up. An Attorney can best answer your question as to a refund of your inspection fees, and, if possible, the reimbursement of your costs to repair.
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This is going to depend on how your contract was worded with the inspector. You first step would be to have a candid conversation with him/her and explain the issue. Most reputable companies will do the right thing.