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Fuel pump noise change w/hazard lights?
Posted by MackA (more from MackA) on Tue, 2 Dec 2003 08:16:58
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Last night noticed that my 91 at idle, with nothing on except for hazard lights, the fuel pump pitch noise was going up and down in perfect synch w/hazard lights on/off. Tried slightly revving engine but then could no longer hear fuel pump
My alt V output is steady/good on both a scope and DMM, but has not been load tested, which will likely do. No batt charging or other known electrical problems [(all wires clean and secure) but ignition probs possible].
Anyone else ever notice this (or may just be an artifact)? Fuel pump fuse is 20A, with these type fuel pumps generally pull 6 - 10 A (IIRC). Doesn't seem it would tax the alt in such a way. All fuel pressures, with exception of dead-heading pump (didn't do), are good (including while driving/bucking). Have hesistation/bucking problem which am t-shooting - just interested in this one FP variation observation
posted by 63.107.255...
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