Q: car hesitates when starting, sluggish when driving and put 15 gallons of gas in gauge still says low fuel

asked by on July 24, 2017

car hesitates when starting, sluggish when driving and put 15 gallons of gas in gauge still says low fuel is it fuel pump or relay?

It sounds like you may have a couple of different issues going on. There are a number of things that may cause the car to hesitate when accelerating such as low fuel pressure, a dirty or faulty mass air flow sensor, clogged or dirty fuel injectors, a faulty throttle position sensor or potentially a bad fuel pump. Other things like a vacuum leak or faulty ignition components such as bad spark plugs or spark plug wires may also cause this kind of hesitation when accelerating.

The fuel gauge fluctuation is a problem likely related to your fuel tank sending unit. The fuel gauge sending unit is a small float type component (or sensor) inside your fuel tank that measures the level of the fuel inside the tank. As the fuel level drops, this change is detected and relayed in the form of a signal to the car’s computer which then displays the reading on the fuel gauge in your dash. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your vehicle.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

One of my front tires is angled different now that I hit a rock. Could an alignment fix it? 2007 Mercedes C230

Hello - you are correct, an alignment is not going to properly repair this damage. There may be a bent or otherwise damaged suspension control arm (lower) or tie rod. I recommend a steering and suspension inspection performed by a...

2010 Ford Fusion SE with I4 Engine - Throttle Position (TP) and Accelerator Pedal Position (APP) sensors

Since the code reads Throttle Body, the sensor on the throttle body under the hood may be the best place to start. The throttle position sensor measures the angle of the throttle plate and tries to match the effort shown...

How do I use voice command to create a memo?

The voice command system allows you to create memos, so that you can make notes or pen your thoughts while driving. Creating a memo takes a few steps. Press the voice command button, wait until you hear the beep,...

Engine light came on after washing engine 2 days later then went off and oil lamp came on three times - driving - went off.

Well, you have a couple of questions here and not a lot to go on, so I'll address them as best I can. Your Check Engine light indicates that a trouble code from a sensor has been registered in the...

My car is overheating

I have never heard of a fail proof thermostat. If your coolant tank has a leak then it may be getting low on coolant. A leaking coolant tank that is unable to hold pressure can also cause the temperature to...

Car leaking oil, oil blows out of dip stick tube

If you had excessive blowby from worn rings and all, then you would have excessive smoking and oil consumption through the engine. It almost sounds like your PCV (positive crankcase ventilation) system is not feeding blowby gasses back to the...

I'm hearing a whining noise from the front of the car.

Hi There, Generally speaking there are two things that can make a whining sound under the hood that would depend on the belt and the speed at which it turns. The alternator will tend to make a whining noise when...

Navigation system not working

The navigation system in your vehicle is a common failure. If this occurred right after a battery change then a code needs to be put in to get it going again. If the system is not turning on at all...

New battery still gives a poor voltage when driving it gives the proper voltage.

The test you performed doesn't really tell the whole story. The alternator may be charging, but not up to capacity. To be sure you need the equipment to load test the charging system and see if the alternator output is...

Related articles

A Buyer’s Guide to the 2012 Ford Edge
In In the ‘80s, families drove station wagons. In the ’90s and ’00s, those got replaced by minivans and SUVs. Today, more and more families are opting for a more fuel efficient compromise that’s also a little sportier and more...
10 Best Stores to Buy Auto Parts in Louisville, Kentucky
Automotive technicians rely on auto parts stores to add and replace car parts. The best auto parts shop in Louisville is NAPA Auto Parts.
P0725 OBD-II Trouble Code: Engine Speed Input Circuit Malfunction
P0725 means there is a problem with the engine speed input circuit due to damaged wires, loose connectors or dirty transmission fluid.