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American Motors Gremlin Fuel Pump Cut-Off Switchs

American Motors Gremlin Fuel pump cut-off switchs

Starting at low prices, AutoBuffy stocks multiple fuel pump cut-off switches from top OE-quality brands. This inertia-activated safety switch cuts power to the fuel pump during a collision to prevent fire. When it fails or trips without resetting correctly, the engine won't start or dies unexpectedly — leaving your American Motors Gremlin stranded even though nothing else is wrong.

Signs your American Motors Gremlin needs a new fuel pump cut-off switch

  • Engine cranks normally but refuses to start and fuel pump makes no priming hum when the key turns to 'on'
  • Vehicle shuts off suddenly while driving and will not restart, mimicking a dead fuel pump
  • Engine starts only after repeatedly pressing and releasing the reset button on the switch
  • Switch reset button is already popped up even though no collision or major impact has occurred
  • Fuel pump runs intermittently — cuts out on rough roads or hard braking and restores when the car sits
  • Scan tool shows no fault codes but a fuel-related no-start condition that clears after manipulating the switch

Which fuel pump cut-off switch should you buy for your American Motors Gremlin?

The main decision is whether to match the OE-style inertia switch or upgrade to an aftermarket calibrated unit. Fitment location — trunk, cargo area, or footwell — varies by vehicle, so confirming the connector type and mounting tab pattern is essential before ordering.

OE-Equivalent Replacement
Best for
Restoring factory function with a guaranteed fit
What you get
Same calibration threshold, identical connector, and direct bolt-in mounting as the original switch
Heavy-Duty / High-Sensitivity Unit
Best for
Vehicles used on rough terrain or with a modified fuel system
What you get
Lower trip threshold catches harder jolts; often rated for higher amp draw from performance fuel pumps
Adjustable Aftermarket Switch
Best for
Track or off-road builds where reset frequency matters
What you get
User-selectable G-force sensitivity so the switch trips only when you want it to, not on every pothole
Integrated Relay-and-Switch Assembly
Best for
Vehicles where the relay and inertia switch are combined in one housing
What you get
Single-unit replacement that eliminates the need to diagnose two separate components when the circuit fails

Replacing the fuel pump cut-off switch on a American Motors Gremlin

Easy⏱ 30–60 minutesFlathead screwdriver or trim panel removal toolPhillips or Torx screwdriver setNeedle-nose pliersMultimeter (optional, for circuit verification)

Disconnect the battery, remove any interior trim panels covering the switch location, and unplug the wiring connector before unbolting or unclipping the old switch. Install the new switch in the same orientation, reconnect the harness, press the reset button to arm it, then reconnect the battery and confirm the fuel pump primes normally before starting the engine. No special torque is required — mounting hardware only needs to be snug so the switch doesn't vibrate loose.

Frequently asked questions

How much does it cost to replace fuel pump cut-off switches on a American Motors Gremlin?
Parts start at low prices at AutoBuffy. The switch itself is inexpensive, but labor adds to the total if the unit is buried under interior trim. Many owners replace it as a DIY job in under an hour, keeping the total cost close to the part price alone.
Can I just reset the fuel pump cut-off switch instead of replacing it on my American Motors Gremlin?
Yes — if the switch tripped due to an actual impact, pressing the reset button restores fuel pump power and no replacement is needed. Replace the switch only when the button won't stay down, the switch trips without cause, or the engine still won't start after a confirmed successful reset.
Where is the fuel pump cut-off switch located on a American Motors Gremlin?
On most vehicles it sits in the trunk, cargo area, or behind a kick panel in the footwell. Look for a small cylindrical or rectangular unit with a colored reset button on top and a wiring connector at the base. Consult your owner's manual — many manufacturers list the location in the emergency section.
Will a bad fuel pump cut-off switch throw a check engine light on a American Motors Gremlin?
Usually not. The switch sits outside the ECM's direct monitoring loop, so a failed or tripped switch rarely sets a diagnostic trouble code. That's what makes it a common overlooked culprit — the American Motors Gremlin has a no-start condition with a clean scan, and the switch is the last thing owners check.
Is it safe to bypass the fuel pump cut-off switch on a American Motors Gremlin?
It is not recommended. The switch exists to cut fuel flow in a collision and reduce fire risk. Bypassing it permanently removes that protection. If the switch is faulty and causing nuisance trips, replacing it with a correctly calibrated unit is the right fix — not wiring around it.
How do I know if my American Motors Gremlin's fuel pump cut-off switch is faulty versus the fuel pump itself?
Turn the key to 'on' without cranking and listen for a two-to-three second priming hum from the fuel pump. If you hear nothing, locate the cut-off switch and check whether the reset button is popped up. If the button is flush and the pump still won't prime, the pump or its relay is the more likely cause.

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