So my fuel pump is definitely on its way out.. loud humming noise when on the gas and I have to give it a good prime for it to start after a few cranks. So I wanted to see where/what is the best pump to get. I think I should replace the sending unit as well.. or should I get a whole new tank? Thanks guys
yeah has been working great. only thing is now I seem to be getting worse gas mileage, I am definitely running rich. How does one tune this computer with out a obd port?
No tuning of this computer. And no need to. Get at least three calculated gas mileage samples before coming to any conclusions. Miles driven divided by gallons consumed. That way, you'll know. Anything less is guesswork.
If you are truly running rich (verify by exhaust analysis is a good way) the map sensor and upstream oxygen sensors are in play here........
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche Without "data", all you have is an opinion!
Not to hijack this thread, but a quick question for walker- Made the mistake and installed the Airtex, it lasted 3 days. I can't find a sending unit assembly for my 88 I6. Napa has a carter pump, but I would need to enlarge the opening on the top cap that holds the pump in the unit, and the screen seems loose, like it may fall off with a good bump. Should I install the Carter pump? Somebody on this forum suggested rebuilding the pump. What would you suggest?
I picked up a Bosch fuel pump, # 69302, but the pump in the tank was longer by about 1 inch, in my '89 Cherokee Laredo. Could not use it. The problem turned out to be the hose connected to the pump and that fixed it (slipped it back on and tightened the clamp). But, I wouldn't mind replacing it anyway seeing as I have over 211,000 miles on it.
Anyone have an idea of what pump I have? I have read that in this model year there is an interesting mix of part manufacturers.