How to reset jeep grand cherokee fuel pump
which engine of the many, ??????
no start but cranks ROBUSTLY right?
turns over means zero, the starter motor and engine both can TURN OVER thus , no meaning, What counts is the crank shaft spins.
called Cranking.
1: check all fuses on both boxes.
2: Is dash I/P cluster CEL lamp glowing keyon?
3: I then connect my scan tool and crank for 5 seconds, not 4 , but 5.
3A: got DTC's (errror) for CMP , CKP or spark or dead RPM?
thats 4 checks,, got them, ? yes, BINGO.
the ECU will not INJECT fuel of those are bad. ever.
there are exceptions, but those guys get lawsuits....
4: above is ok , i check spark (some do this first. sure thats makes sense , always)
5: ok I got spark on all cylinder, NO , fix that or do step 3 again.
6: i try test fuel, I spray it in and BAM it runs for 3sec, and dies.
if it dont run, are those 100k miles spark plugs long dead???? ever do tuneups, ever?
if runs 3 sec, and sound great. then you lost fueling.
i check for flooding only if spark is good.
if you get here, the story can go long play, as fueling is complex.
( no injections, leaking , clogged, ECU inputs all wrong, fuel pump dead or weak, FPreg fubar. long..... ask.)