Intermittent accelerating issue

Tiny
DANMART89
  • MEMBER
  • 2013 HYUNDAI SONATA
  • 2.4L
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Car sometimes does not want to accelerate. I have to let go of gas while driving in order to catch again.
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Tuesday, August 13th, 2019 AT 10:56 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

Have you checked fuel pump pressure? What you described sounds like it is starved for fuel. It could be as simple as a partially plugged fuel filter or a weak pump. What I recommend first is to check fuel pressure to confirm it is within the manufacturer's specs.

Here is a link that explains in general how it is done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions specific to your vehicle. They include the manufacturer's specs for pressure. However, they also include info related to a bleed down test which isn't the issue. The attached pics correlate with the directions.

____________________

2013 Hyundai Sonata L4-2.4L
Component Tests and General Diagnostics
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
Fuel Pressure Test

1. Release the residual pressure in fuel line .

CAUTION:
When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.

2. Install the Special Service Tool (SST).
(1)Disconnect the fuel feed tube from the high pressure fuel pump.

CAUTION:
There may be some residual pressure even after "Release Residual Pressure in Fuel Line" work, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection.

(2)Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the high pressure fuel pump .

pic 1

3. Inspect fuel leakage on connections among the fuel feed tube, the high pressure fuel pump, and the SST components with IG ON.
4. Measure Fuel Pressure.
(1)Start the engine and measure the fuel pressure at idle.

Fuel Pressure:445 - 455 kPa (4.5 - 4.6 kgf/cm2, 64.5 - 66.0 psi)

NOTE:
If the fuel pressure differs from the standard value, repair or replace the related part .

pic 2

(2)Stop the engine, and then check for the change in the fuel pressure gauge reading.

Standard Value:The gauge reading should hold for about 5 minutes after the engine stops

NOTE:
If the gauge reading should not be held, repair or replace the related part .

pic 3

(3)Turn the ignition switch OFF.
5. Release the residual pressure in fuel line .

CAUTION:
When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.

6. Test End
(1)Remove the Special Service Tool (SST) from the fuel feed tube and the high pressure fuel pump.
(2)Connect the fuel feed tube and the high pressure fuel pump.

Fuel Pressure Test

1. Release the residual pressure in fuel line .

CAUTION:
When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.

2. Install the Special Service Tool (SST).
(1)Disconnect the fuel feed tube from the high pressure fuel pump.

CAUTION:
There may be some residual pressure even after "Release Residual Pressure in Fuel Line" work, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection.

(2)Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the high pressure fuel pump .

pic 4

3. Inspect fuel leakage on connections among the fuel feed tube, the high pressure fuel pump, and the SST components with IG ON.
4. Measure Fuel Pressure.
(1)Start the engine and measure the fuel pressure at idle.

Fuel Pressure:480 - 520 kPa (4.9 - 5.3 kgf/cm2, 69.6 - 75.4 psi)

NOTE:
If the fuel pressure differs from the standard value, repair or replace the related part .

pic 5

(2)Stop the engine, and then check for the change in the fuel pressure gauge reading.

Standard Value:The gauge reading should hold for about 5 minutes after the engine stops

NOTE:
If the gauge reading should not be held, repair or replace the related part .

pic 6

(3)Turn the ignition switch OFF.
5. Release the residual pressure in fuel line .

CAUTION:
When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.

6. Test End
(1)Remove the Special Service Tool (SST) from the fuel feed tube and the high pressure fuel pump.
(2)Connect the fuel feed tube and the high pressure fuel pump.

_________________________________

If you find the fuel filter or the pump is the issue, here are the directions for replacement. Note that to replace the filter, you have to remove the fuel pump from the tank. Note, if you have to replace the fuel pump, make sure to do the filter at the same time.

2013 Hyundai Sonata L4-2.4L
Removal and Replacement
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Filter Service and Repair Removal and Replacement
REMOVAL AND REPLACEMENT
Replacement

1. Remove the fuel pump .
2. Disconnect the electric pump wiring connector (A) and the fuel sender connector (B), and then remove the fuel sender (C).
3. Disconnect the fuel tube quick-connector (D).
4. Remove the head assembly (E) after releasing the fixing hooks.

pic 7

5. Disconnect the fuel feed tube quick-connector (A).
6. Remove the fixing clip (B), and then disconnect the fuel tube (C).
7. Remove the reservoir-cup (D) after releasing the fixing hooks.

pic 8

8. Disconnect the ground cable (A).
9. Remove the cap (B), and then remove the assist pump (C) and the fuel pressure regulator (D).

pic 9

CAUTION:
Be careful of O-ring.

10. Separate the electric pump motor from the fuel filter after releasing the fixing hooks (A).

pic 10

pic 11

pic 12

1. Head Assembly
2. Electric Pump Motor
3. Fuel Filter
4. Fuel Sender
5. Fuel Pressure Regulator
6. Assist Pump
__________________________________________

Here are the directions for removal and replacement of the pump assembly.

2013 Hyundai Sonata L4-2.4L
Fuel Pump
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Service and Repair Removal and Replacement Fuel Pump
FUEL PUMP
Removal

1. Release the residual pressure in fuel line .
2. Remove the fuel pump service cover (A) in the trunk.

pic 13

3. Disconnect the fuel pump connector (A) and the fuel tank pressure sensor connector (B).
4. Disconnect the fuel feed tube quick connector (C) and the vapor tube quick-connector (D).
5. Remove locking ring (E) by use the special service tool [SST No. : 09310-2S200].

pic 14

6. Disconnector the vapor tube quick-connector (A) at the fuel pump, and then remove the fuel pump from the fuel tank.

pic 15

pic 16

Installation

1. Installation is reverse of removal.

CAUTION:
Be careful of fuel pump direction.

_________________________________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Tuesday, August 13th, 2019 AT 9:30 PM

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