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So I drive a 2000 kodiak rollback tow truck. It has the cat (3126..?) Motor. Ive got dual step tanks and for some reason only the driver side tank drains. There is a fuel sender in the driver tank, the passenger only has a vent on top and a petcock feeding into a line at the bottom that runs to the bottom of the other tank under the trans. It runs great drains the driver tank fine but the passengers is full never empties. We drained the tanks replaced the line and checked the petcocks, checked both vent lines which appear fine. The driver tank has pressure when you open it, passengers does not. We have no idea what's wrong and it's doubled our fuel stops getting about 5-7 mpg. Any help would be appreciated

Hi everyone. I have a 2000 Suburban I just bought a couple months ago. I got a couple of check engine codes I've been working through, but I'm stuck on these last three. I have the following current codes: P0175 (System Too Rich Bank 2), P0420 (Catalyst System Efficiency Below Threshold Bank 1), and P0430 (Catalyst System Efficiency Below Threshold Bank 1). I had codes for knock sensors as well, but got them replaced, and only these three codes remain. I took temperatures at the exhaust ports on the manifolds on both sides. Bank 2 was significantly hotter than bank 1. By more than 100F-150F. I took temperatures at the inlet and outlet of both cats. Sometimes the outlet was hotter, sometimes it wasn't. I have a cheap Walmart infrared so I take all temp readings with a grain of salt however. Outlet temps were within 100F of the inlets. I also took readings of the o2 sensor voltages for upstream and downstream for both banks. The upstreams appeared fine but the downstreams were pretty inconsistent. Sometimes staying pretty flat near 0.03v, other times they'd spike. They did this regardless of being at idle, or revving the engine at 2000rpm in park. I'm slightly confused at the information I gathered today, I'm trying to determine what road to go down. I'm good at working on things, not so much diagnosing. I plan on replacing both downstream o2 sensors with new ACDelco's to start, and that should tell me if the cats are bad if the codes come back, if my thinking is correct. But I'm most confused about how one bank of cylinders could be running rich, but the other isn't? Shouldn't all fuel injectors be getting the same amount fuel, at the same pressure? Everything I've found online says if I have P0175, I should also have P0172.

So, I have been having this sound coming from the front right wheel. I thought it was the wheel bearing but it doesn't really sound like it too much to me. I thought to maybe grease the fittings as well but I wanted to see if anyone else had experienced this problem before. Thanks! (Skip to the end for a better sound). New Recording 7.m4a