Skip the auto shop - Our mechanics make house calls

Q: Truck will act like it is not getting enough fuel when cruisng. RPMs drop then comes back up or under load

asked by on

idles great, mash down accelerator runs fine put a load on it stumbles acts like it out of gas

My car has 230000 miles.
My car has an automatic transmission.

A: Hello. I think you have called it, this is ...

Hello. I think you have called it, this is almost certainly a fuel supply issue. Installing a fuel pump pressure gauge which can be observed while driving will confirm this. Sources could include a worn out fuel pump, a fuel pump relay with burned contacts, a clogged fuel filter, clogged fuel injectors, or a failing fuel pressure regulator. I would recommend having a loss of power inspection completed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and estimate for repairs.

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

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: Vibration in car body when in Drive

A few different items can cause the vehicle to have a vibration. The most likely would be a misfire, engine mount, or transmission mount. Most vibrations have a RPM range at which they are most noticeable. Increasing the idle if...

Q: Replaced fuel pump in tank. But still no gas getting to carb. Gonna check filter under bed in morn to be sure it's working

With a fully charged battery, if the pump volume and pressure at the tank outlet is normal, but pressure falls off at the delivery point (carburetor, fuel rail), there is a restriction somewhere in the line and/or in the fuel...

Q: Ticking sound while accelerating and when the car is in gear

There is technical bulletins for your vehicle using aftermarket oil filters. These oil filters may look like they fit your car model, but do not allow the proper oil flow to the motor and can cause noises and internal engine...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...