Join Date: Jan 2008
Location: Bellingham, PNW
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If your tank has a internal fuel gauge / sending unit - you should be able to remove it - and use one of those telescoping mirrors to look into the tank. One thing to note that, cutting out an inspection hole - you want to make sure the tank is bone dry and allowed to air out (ie- by removing the fuel gauge / sending unit.) so that all the vapors escape.
Also, be wary of what this does for Survey purposes - tanks are tested to meet certain pressure requirements and depending - a surveyor could flag the new addition as not into specs for the particular tank (hardly unlikely but it is possible especially if it is apparent it is a DIY jobby).