Mass Air Flow Sensor problems of the 2014 Toyota Tundra

Truck was in Toyota shop in vermont for stalling of vehicle. Thought it was fuel pump due to recent recall - specifically asked if it could be that and was told no. They found mice nest in intake manifold, knock sensor was found to be chewed, and replaced. Once I received my vehicle, it continued to do the same thing after 2 days. Upon looking under the hood, found that the air intake filter was left off. I fixed that, and then the same issue starting occurring again. Had to have my vehicle towed to different shop (to trusted mechanic) they have found after replacing the battery and a mass air flow sensor, that it is truly in fact the fuel pump. They tested fuel pump and it's only putting out 20psi instead of 40. I called Toyota, but they are claiming that only the newer Toyotas are affected, but on the recall list it goes back to 2013 in different models. This seems similar to the issue Subaru was having with their air bags. My Toyota dealership, should not just be assuming that this couldn't be correlated with faulty fuel pump. My vehicles symptoms are the same as what the recall has stated happens. Before denying me anything, they should be willing to at least investigate and look at my vehicle. It's also suspicious to me that my vehicle started doing this about 2 weeks prior to a huge safety recall coming out in regards to fuel pumps.