Question about 1992 Jeep Wrangler
The ASD relay shuts off 3 things
2: fuel pump
3: and kills injector power.
you guessed and he guessed.
when the car cranks and not start, we scan it next
or if no scan tool, you are left with the key on 3 times get codes test/
if you key on and the CEL lamp is dead that means the ECU is dead
or fuse bad, cracked or rusty.
when the pump goes dead, make sure the ASD energizes
or its all just a waste of time back aft.
the ASD closes for about 2 seconds,
the pump runs too.
if the ECU sees errors during the cranking for 2 seconds.
the ECU drops the ASD and PUMP dead.
by law. too. the anti crash and burn logic is inside the ECU/PCM
the 91-92 ,we have no cheap scan tools until 1993.so....
to fix any modern car EFI it takes a scan tool or lots of labor
so get in the car, crank for 5 seconds as that service manual chapter 8d tells you, then release the key, then turn off and on 3 times
inside 3 seconds, and see the CEL flash out codes.
(no DRB scan tool that is all you get there)
if no hope still.
see the 7-8 ways the ASD Can drop here.
your car is older, and less ways to drop out.
you said smack tank, sure.
but ment , smack it, then get in car and pump runs 2 seconds key on, right,,
did you consider the ground wire to the pump is bad.?
did you condsider the power wire or pins bad, in cars harness
and the smacking jarred thosE>?
I use a voltmeter, to find all this when failed.
my guess, your mech, didnt do that first?
if he did, and 12vdc is across pump for 2 seconds pump is bad.
if he did and 0v or low, low volts is across pump pins the its not the pump or is wire, connectors, to pump (harness et al)
or ASD DID THIS ON PURPOSE>
next would be measure all 4 ASD pins,
see whats going no here, and pump relay pins
Diagnosing, it after it self cures it self is near impossible.
Posted on Mar 07, 2017
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Posted on Jan 02, 2017
You do not have to replace the fuel pump at a specific mileage.
I hate to speculate without physically inspecting the vehicle, but, my best solution here & now may be the fuel pump. Now, I would not go out & buy one before you had proper diagnosis. Here is one test, but you will need to have to experience the stall again, and then test to see if you have fuel pressure at the injectors. If you have no fuel pressure, replace the pump. Fuel filter issues do not "come & go", they stay, and your car would not run properly. Also, a fuel pump failure will not set a computer code on this particular model vehicle. Hope this helps..
Posted on Sep 15, 2008
SOURCE: I asked this question on
The LS Lincoln Has 2 Fuel Pumps . The One On The Drivers Side Is Called A Transfer Pump , It Pumps Fuel From Drivers Side Of Tank To Passenger Side Both Pumps Have Sending Units On Them The Transfer Pump Sending Unit Was Bad
Posted on Feb 24, 2010
Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.
If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.
Posted on Mar 10, 2010
have u ck out the ignition switch [not the key & tumblers],, or the neutral safety switch to see if u have power ,,also seen broken wire at solenoid on starter too,,hope it helped,,
Posted on Apr 05, 2010
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