Skip the auto shop - Our mechanics make house calls

Q: Is it a fuel pump issue?

asked by on

My truck will stall when the rpm goes below 700. No check engine light comes on. Temperature is fine. Oil and gas are fine. I cannot strt the engine again without doing this method: press down on the gas pedal, take foot off gas pedal, and then press down halfway on gas pedal while turning key. I don't hear any strange sounds. No smells.

My car has 169000 miles.
My car has an automatic transmission.

It’s possible that a failing fuel pump, or a clogged fuel filter or fuel injectors for that matter, can cause stalling at idle but there are other common causes such as vacuum leaks, EGR system faults, sensor faults such as the mass airflow sensor, as well as problems with the throttle position sensor and idle air control valve. Although the check engine light is not on, a Mechanic would still look for stored or "pending" codes to aid the diagnosis. A certified professional from YourMechanic would simply test each of these systems methodically, in turn, until the fault is found. It should be pretty easy in your case because you are not describing an intermittent problem, that is the fault is always there below 700 RPM and thus one of these systems is going to report "out of range" once tested per FSM (Factory Service Manual) specifications.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Tire Rub on 66 mustang

Hi there. It could be a combination of both worn shocks or tire diameter is too tall. If the rear end has not been altered from stock, the rear tire can be +1 in overall size and typically not impact...

Q: Brake light comes on momentarily after hard braking (like going down a hill) but only after coming to a complete stop

If your brake fluid is a little low then when you brake hard or first stopping then the fluid my just need to be topped off. Have the fluid checked and if just a little low on fluid then top...

Q: Probably it feeds too much gasoline and don't respond to the accelerator pedal. Then the engine stops.

Check the fuel pressure and see if you have 30 psi or more at the fuel rail. If there is fuel pressure, then remove the fuel injector harness to each injector and check for power as the engine is cranked....

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.