ColoCherokees
NAXJA Forum User
- Location
- Littleton, CO
I bought this '89 (4.0/AW4/231) in April - 107K, excellent condition. Went for a drive yesterday, and the weather turned out to be pretty warm (low-mid 90s). After about an hour and a half of 65-75 mph driving, I could hear a loud "humming/buzzing" coming from the rear when I came to a stop. Shifting to park or neutral had no effect. No driveability problems - and just for the record, the stock closed system did just fine in some extended stop and go traffic in the heat (A/C on).
I've searched and found that noisy fuel pumps are a known issue for the Renix era, but why would mine be quiet for ~2 months of regular driving, then suddenly get loud? Tank never got below about 1/3 full (have had it lower before with no noise). Indicator of a pump on its way out? New noise, but normal noise? Only happens during extended hot weather operation? Just want to know if I need to budget for a new fuel pump in the near future.
I've searched and found that noisy fuel pumps are a known issue for the Renix era, but why would mine be quiet for ~2 months of regular driving, then suddenly get loud? Tank never got below about 1/3 full (have had it lower before with no noise). Indicator of a pump on its way out? New noise, but normal noise? Only happens during extended hot weather operation? Just want to know if I need to budget for a new fuel pump in the near future.