I have a 1995 Astro 4.3. The PCM fuse popped a few days ago...which of
course also powers the Fuel Pump Circuit. I have good factory wiring
diagrams on this... I am not sure where to start troubleshooting...My
instinct is to power up the Fuel Pump Circuit direct from the battery with a
5 or 10 amp fuse and see if that fuse pops before the PCM fuse...
Before I start cutting wires and heading off on the wrong path...I thought I
would ask you experts if you have any suggestions based on your experience
which might be a common fault with this circuit that I should check...
Thanks for the advice but I think you need clarification on what I am
Firstly I am describing the problem with a fuse blowing on the PCM which
disables the Fuel Pump. All I am asking before I start diving into the PCM
connector plugs looking for shorts or other wiring problems is an opinion
from this group of any experiences with this problem and the first place to
check...This might save a lot of troubleshooting if someone knows of a
common problem on these vehicles that I can try first.
Secondly, I am not about to go indiscrimately powering up circuits. I know
better. What I had said is that I am likely going to power up the Fuel Pump
Circuit with a separate fused jumper to see if the PCM fuse still blows...If
it blows with the Fuel Pump being separately fused...then it is not likely
the fuel pump. If the fuel pump fuse pops...than I can start looking in that
circuit...probably closing in on a fuel pump problem...
So in effect...I am just simply asking some advice on the best place to
Not a mechanic, just an old long retired electrical guy, so take what
I say with a grain of salt...
Having forewarned you, I doubt very much that you're going to learn
anything at all of value by powering your pump separately. If you still
feel compelled to try it, I'd rather you try disconnecting the pump
instead - and see if your pcm still blows it's fuse.
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