Q: Car hesitates and slows down badly at times. It almost stalls at times. It keeps slow speed at 20-30KM.

asked by on September 15, 2016

Kia Carnival 3.8L Petrol:car hesitates at times and slows down badly at times. It almost stalls at times. It keeps slow speed at 20-30KM. more so when low on gas 1/4 or less tank. most of the time is ok. I have driven it on very low gas and may also have put bad gas in it. Need to know where the gas filters is as there is nou opening in side the van as is the case with older Kia Vans. What is the likely cause? where is the fuel filter and gas pump etc.

My car has 130000 miles.
My car has an automatic transmission.

Fuel Pump Replacement $145.32 - $1299.70 Get a Quote
Engine hesitates during acceleration Inspection $94.99 - $114.99 Get a Quote

Hello. I would need to know the year of the vehicle to know where the fuel filter is located. If this is an older model, it is located under the vehicle. Most of the newer models only have a filter on the fuel pump.

From what you are explaining, it sounds like the fuel pump is failing. When the fuel is low, the pump will get hot and a weak pump will lose pressure causing this to occur. I would usually check the fuel pressure to see if it is low, especially when the fuel level is low. If it is, then the pump needs to be replaced. If you plan on having this done, consider YourMechanic, as a certified technician can come to your home or office to diagnose the hesitation problem and guide you with repairs.

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

How do I hang up a call with HandsFreeLink?
To hang up a HandsFreeLink call, simply press the hang-up button. An incoming phone call will interrupt your audio system.
Car overheated and rattling
Hi. Overheating is a serious issue and can cause significant damage to the engine such as breaking the head gasket or even damaging the cylinders and pistons. You should have a certified technician, such as one from YourMechanic, inspect the...
My car has a mass air flow circuit range issue
Hello. P0101 (https://www.yourmechanic.com/article/-p0101-obd-ii-trouble-code-mass-airflow-maf-circuit-operating-range-or-performance-problem-by-john-nelson) is the trouble code for an issue with the MAF sensor circuit range. This code is set when the computer detects an issue with the vehicle's MAF sensor signal. If the MAF sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) has been replaced,...
My cooling fan comes on after its been turned off for 10 mins. I have replaced one of three relays and the PCM
There is a cooling fan relay fuse in the fuse box that controls the relay switch. This can sometimes fail (https://www.yourmechanic.com/services/cooling-fan-relay-replacement) which will cause the relay to work intermittently causing the fans to also work intermittently. I would recommend checking...
Would a bad pcv valve make the engine run hot
Hi there. From the description you have provided, your vehicle's bad PCV and coolant loss are not related. The PCV (positive crankcase ventilation) valve is designed to remove combustion gases that get past the piston rings into the engine. Typically,...
Can I disarm my seat belt chime in Nissan Micra k12
Try to connect all the passenger seat belts even if no one is in it. Make sure you wear seat belts if in seat. Sometimes the seat sensor detects someone in the front seat passenger side even when no one...
My car is making a weird rattling noise
If the noise occurs at idle, typical causes are the accessory (belt driven) components, the torque converter or an engine component. As you describe the rattling, it is marked enough that a mechanic would likely pinpoint it quickly on inspection....

Related articles

Is It Safe to Drive with the Check Engine Light On?
The check engine light is tied into your car’s onboard diagnostics system, and it’s designed to light up (usually in yellow) whenever...
Is it Safe to Drive With an EVAP Leak?
While it is safe to drive with an EVAP system leak, it causes excess car pollution. Fixing the problem is often as simple as tightening the gas cap.
Symptoms of a Bad or Failing Main Relay (Computer/Fuel System)
Common signs include the engine not starting, inability to stay running for a long time, and the Check Engine Light coming on.