Tech Tip: Fuel Pump is the Rx for this Infiniti QX56 – UnderhoodService

Tech Tip: Fuel Pump is the Rx for this Infiniti QX56

Recently, a customer encountered trouble climbing a grade in his 2005 Infiniti QX56 while towing his boat. He called to express his concerns about the Infiniti’s sudden lack of power. When accelerating with wide open throttle, the engine power is ....

By Eric Seifert
Automotive Technical Editor

Recently, a customer encountered trouble climbing a grade in his 2005 Infiniti QX56 while towing his boat. He called to express his concerns about the Infiniti’s sudden lack of power.

When accelerating with wide open throttle (WOT), the engine power is reduced.

Actions
1. Check fuel pressure during a transmission Stall Test (see Service Procedure).

2. If fuel pressure test is NG, replace the fuel pump.

Note: Low fuel pressure may cause DTCs to be detected. If you have DTCs with this incident, first replace the fuel pump and then recheck the DTC diagnosis.

Important: The purpose of these “Actions” is to give you a quick idea of the work you will be performing. You must closely follow the entire Service Procedure as it contains information that is essential to
successfully completing this repair.

Applicable Vehicles: 2004-’07 QX56 (JA60); 2004-’06 all VINs; and 2007-Built before 5N3M08(**)7N 806064 (Built before Feb. 22, 2007)

Parts Information: A new fuel pump, P/N 17040-7S20A (2004-’06) or 17040-ZE00B (2007), along with a fuel pump O-ring, 17342-7S000, may be required to complete the repair. See Figure 1.

Service Procedure
1. Connect a fuel pressure gauge to the engine (special tool kit J-44321 or equivalent).
• Follow all instructions under “Fuel Pressure” in ALLDATA for connecting the fuel pressure gauge.

2. Look at the fuel pressure while performing a transmission “Stall Test.”
• The Stall Test 10-minute warm-up is not needed for this Service Procedure.
• Follow all other instructions for performing the Stall Test under Automatic Transmission Testing in ALLDATA.

Caution: Do not hold down the accelerator pedal for more than five seconds while performing the Stall Test.

• Fuel pressure is NG if it drops below 45 psi during the Stall Test.
– If the fuel pressure is OK, this bulletin does not apply.
– If the fuel pressure is NG, go to step 3.

3. Replace the fuel pump.
• Follow all instructions under Fuel Pump in ALLDATA.
• Use the fuel pump listed in the Parts Information.
• Make sure to use a new fuel pump O-ring seal.

4. Test-drive the vehicle; make sure the incident is fixed.
Note:
• Low fuel pressure may cause DTCs to be detected. If you have DTCs with this incident; first replace the fuel pump and then recheck the DTC diagnosis.
• DTC diagnosis and repair is not covered by this procedure.

Written by ALLDATA Technical Editor, Eric Seifert, an ASE certified Master Technician and Engine Machinist, with 20 years of independent shop and parts store experience.

Courtesy of ALLDATA.

For additional information, visit www.alldata.com.

You May Also Like

EVs Are Not Maintenance-Free

While EVs have fewer maintenance needs than their combustion counterparts, they still offer unique service needs.

By Steve Knoble

It doesn’t matter where you land on the love/hate spectrum of electric vehicles (EVs) — they are undeniably part of our world now. The popularity of electric motorcycles, dirt bikes, bicycles and UTVs is on the rise. Electric UTVs are becoming increasingly popular within the fleet vehicle industry. Youth dirt bikes are incredibly sought-after due to their abundance of torque and quiet operation, making them ideal for kids who want to ride endlessly without annoying the neighbors. Electric motorcycles are also gaining traction, thanks to the availability of charging options and reduced charging times, making them an excellent option for local motorcycling.

Do Severe Duty Brake Pads Trade Power For Longevity?

Accepting reduced component life for better braking power in severe-duty applications may be a thing of the past.

AAA Survey Says EV Excitement Is Declining

Fewer consumers plan EV purchase, though hybrids may help ease anxiety about technology moving forward.

Dealing with Deposits to Boost Engine Life

Valvoline’s Restore and Protect fully synthetic motor oil helps both older, high-mileage vehicles (restore) and new vehicles (protect).

Ball Joints – How To Avoid Memory Steer

Follow all instructions to avoid issues caused by incorrect installation. This video is sponsored by Auto Value and Bumper to Bumper.

Other Posts
Sustainability And Automotive Batteries

Sustainability starts with you, and recycling is a great way to go green. This video is sponsored by The Group Training Academy.

PRT Releases 28 New Complete Struts in North America 

The new items represent nearly 6 Million vehicles in new coverage and come to expand the PRT portfolio in the North American Aftermarket.

Alternators and Ripple Voltage

The alternator produces an AC current that must be converted into DC current by way of a rectifier.

Mullen Announces EV Battery Exchange Program

POWER BOOST enables existing Class 1 EV cargo van customers the opportunity to upgrade their lithium-ion battery packs to solid-state polymer battery packs, increasing Class 1 vehicle range to over 200 miles.