Bronco ll 1986, roughs great with full tank, very rough with low level in tank

Asked by Nov 15, 2013 at 03:19 PM about the 1986 Ford Bronco XLT 4WD

Question type: Maintenance & Repair

1986 Bronco ll, 2.9L fuel injected., new plugs, dist cap, fuel filter.  Cleaned fuel injectors
and tested fuel line pressure.
Climbs hills no problem with a full fuel tank.  Half full, seems like there is a governer at
3000 revs, oscillates between 3K and 2.8 K.  At a quarter full, seems to almost die, revs
up, drops revs.  No acceleration, only on hills.  My mechanic is at a loss.

4 Answers


Have you pulled the pump/sender out of the tank to check the fuel pick-up? It's just a light-weight nylon sock on the end of the pump.

1 of 1 people found this helpful.

No, we checked the fuel pump pressure, but obviously not on a hill. I will get my mechanic to do that. We did have a new fuel gauge so years ago, not sure if that was the start of the problem as I normally keep the tank full.


I remembered the late '80's - Taurus fuel tanks would "oil-can" on a warm day - the bottom of the tank would pooch out and drop the fuel below the pickup tube. They'd run out of gas with a 1/4 tank of fuel on the gauge.

1 of 1 people found this helpful.

That's is the same in my Bronco, I was thinking that the new fuel gauge is set wrong because it seems out of gas at 1/4 full.

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