Question about 1993 Jeep Wrangler

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Fuel ECU fuse keeps blowing (30 amp)

I just bought a 93 wrangler with a 4.0 the other day and yesterday it really started messing up, the fuel ecu fuse keeps blowing, i went through 6 fuses yesterday and cant figure out the problem, when the fuse blows the jeep dies, when i put a new fuse in the jeep it wont start back up unless i poor gas on the air cleaner like im priming it, it seems like the fuel pump shuts down for a while also when it happens, i tried to reset the ecu but did not help, can anyone help, any suggestions? thanx

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  • brian5447 Jun 14, 2009

    is there a way to test the fuel pump for binding without dropping the tank by contanuity?



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Your fuel pump is internally binding and causing the fuse to blow. Change the pump (and filter while you're back there.)

Posted on Jun 14, 2009

  • Richard Scordino Jun 15, 2009

    You can listen for the pump at the tank. If you don't hear it, it's not running. You can also put a pressure gauge on the fuel rail to test pressure there while in no-start condition. Check harness side of pump connector to make sure power is getting there from relay also.


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Hi i had the same problem but the fuse 30amps is getting cut everytime when i turn the key ...even i fix new pump and new relay

Posted on Feb 03, 2013


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92 geo tracker keeps blowing fuel fuse 15 amp but when I go to a 20 amp it is fine gas tank is haff full of fuel what is my problem

first off each fuse has a name , so what is the correct name, the 92
has 3 EFI fuses, DOME (memory) IG-Coil (ecu and spark) and "FI"
never up the amps ever or burn the wires up. sorry but that is a FACT. the a above data is wrong, this cars pump draws 4amps.
if more its bad, sure if over 15 it blows, but is a bad pump.
all pumps like to do that, they burn up and suck power, like a piggy.
see your fuse here, linked,
this car and ECU nor know for shorted pumps and shorted ECU
the 92 uses these JUNK brand caps, large electrolytic caps.
and they love to short, on all 89 to 95 trackers and sidekicks in usa.
they are marked Rubycon.

so again which fuse?
ill pretend its FI blown

FI is bottom right, lost the cover? now you have one.

is engine 8 valve or 16?, they have different EFI , systems.
Im sure its FI, as it runs ECU and pump. so..... and they love to blow.

ok i throw dice for you, land on 8v.
see 8v FI fuse here?

what i do is remove the left rear tail light,lens.
then see the pink pump wires, I measure the pump current
i reads 4 amps, with helper keying on over and over.
now if near 4amps, then the ECU is shortings it CORNER cap.

the caps dry out,inside, leak acid , wreck copper traces
and then the cap shorts, some times , it loves to short on speed bumps. due to vibration, its just a bad 50 cent part
that any tech can change or any HAM radio guy, etc.
with simple soldering tools and skills
do tell engine type G16a or b (a= 8v, and b = 16v) and we can
point to exact part bad.

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Fuel injection fuse keeps blowing

can be lots of things, top reasons are.
is this the 16valve.>? or 8?
shorted ECU, caps shorted out , inside, (1 time event)
shorted injectors 1 of 4
shorted fuel pump very common. and overloads ECU 12v power lines
16v only:

ecu shorting is vary common 89 to 95, and never newer years.

more schematics, if not 16v see em, here.

i use and DC amp clamp meter to find who is shorted (acid test way)

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1991 Honda Civic SI will not start. #14 fuse which is marked alternator/solenoid keeps blowing when trying to start. I am trying to find out what feeds into this fuse to make it keep blowing. My other...

ok first there could be a direct short in the ecu causing the fuse to blow OR the alternator/starter solenoid could be shorting out and blowing the fuse unhook the alternator and see if it blows the fuse then repeat with the starter and the ecu and let me know what happens

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I have a 2000 Hyundai Accent that keeps blowing the ECU 1 Fuse. I can change it one time and it will last for three weeks then before you know it I can change it 5 times in one day. What does the ECU 1...

The ECM1 fuse blowing usually indicates that the fuel pump wires shorted inside the tank. If you drop the tank and remove the module, you will probably find the insulation burned off the gray pump wire.

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My fuel ecu fuse keeps blowing?

Unplug the O2 Sensor and see if it blow again. If it does not the sensor is faulty. Replace with a new one. BTY its in the exhast system.

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1999 Hyundai elantra died while driving found ecu fuse blown replaced lasted half a mile and blew again

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Keep It Super Simple! It never fails!

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Blowing ECM-B fuses

The first thing you should do is to locate the oil pressure switch/sending unit.

This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.


When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM B blow is because the harness is grounding/shorting.


DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.

Please post up day on the comment window/page.

I will follow up on it later.

Good luck.

Aug 24, 2008 | 2000 GMC Savana

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