Gas gauge drops to E gas light comes on full tank of gas .check engine light

Mechanic found one online 3 year warranty buying one used 150. Hoping it works I would have rather just paid for the sending unit my question would be if I buy the whole pump will that fix this problem or will I still have to buy the sending unit

well,i didn't really think you wanted a used one,but there are plenty of them on Ebay for $50.00 to $80.00 USED! this is the complete assembly..really all you need is the sender,,that is the part that has the float/arm/switch.but you can get the whole assembly,pump included for $50.00-$80.00..i just did this a while back for a vehicle and it works perfect.i paid $26.99 for mine,been about a year ago.i saw it listed on Ebay and the place that was selling it was a scrap yard 15 miles from my house,so i just drove right on up there and picked it up.