Thank you for your question. I look forward to working with you to provide you the information you are seeking.
Whenever people ask if they can represent themselves, we have to ask if they would consider performing an appendectomy on themselves or their close family member, since the difference between going to small claims court and going to civil court is the difference between putting a band aid on a small cut and requiring sutures or an appendectomy.
You have basically two consumer laws at play here. First, you have the breach of warranty law, which is governed by the warranty that came with the pump. Most warranties cover only the bad part and obligate the manufacturer/seller to cover the cost of the part and nothing more.
Second, you have product liability law, which is outside of the warranty law, which is contract law. Under product liability law, you have to argue and prove the pump you received was defective in design or manufacture and as such the manufacturer/seller is strictly liable for ALL damages the defective part caused. Thus, you have to get that part examined to determine if it was a manufacturing or design defect (as opposed to just a part that failed) in order to succeed on this type of claim.
These are the two types of consumer laws designed to protect consumers. If they reimbursed you for the part, then they have satisfied the warranty claim, so you have to prove defect in manufacture or design to get your additional damages paid under product liability law.
I truly aim to please you as a customer, but please keep in mind that I do not know what you already know or don't know, or with what you need help, unless you tell me. Please consider that I am answering the question or question that is posed in your posting based upon my reading of your post and sometimes misunderstandings can occur. If I did not answer the question you thought you were asking, please respond with the specific question you wanted answered.
Kindly remember the ONLY WAY experts receive any credit at all for spending time with customers is if you click on OK, GOOD or EXCELLENT SERVICE even though you have made a deposit or are a subscription customer. YOU MUST COMPLETE THE RATING FOR THE EXPERT TO RECEIVE ANY CREDIT, if not the site keeps your money on deposit.
Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous.