Chevrolet Express fuel pump problems

Filed Sep 24, 2026 · Electrical, Engine · MA

The vehicle is experiencing an under-chassis manufacturing wiring harness restriction (Connector X185) that was installed too tightly from the factory, dropping the 5-volt reference power circuit down to 0 volts under load. This intermittent electrical failure completely starves the fuel pump, causing the fuel loop pressure to drop to a dangerous 43.5 PSI while driving (GM factory specification is 55–100 PSI). This electrical breakdown simultaneously chokes the fuel tank vapor loops, causing the fuel tank pressure to spike to an extreme -1100 vacuum pressure parameter. This results in severe engine hesitation, random vehicle starving of fuel, an abysmal 9.9 MPG average compared to the 13 MPG combined standard, and an automated network communication failure resulting in four distinct audible dashboard warning beeps. It also cuts power to the Brake Pedal Position sensor, crashing the StabiliTrak traction control system. This creates a severe, immediate safety hazard under heavy highway driving conditions. This active powertrain hazard has been verified by a certified independent service center via secondary diagnostic data stack logs. MacMulkin Chevrolet is currently holding the commercial vehicle and explicitly refusing to execute the necessary wiring harness circuit trace to resolve the underlying hazard because a dashboard light is not illuminated, leaving a documented safety defect completely un-repaired on a commercial asset.

Filed Aug 10, 2026 · Fuel system · OH

Vehicle broke down with a crank no start condition. Verified no fuel pressure. Diagnostics revealed no continuity between tank fuel pump positive lead at fuel pump relay, and ground. Removed fuel tank, disconnected fuel pump wiring harness, and found burned pin at positive terminal of fuel pump and mating harness connector. Harness displayed significant distortion and charring consistent with a poor connection.

Filed Jan 9, 2026 · Acceleration, Engine · 56,837 miles · WA

The contact owns a 2024 Chevrolet Express. The contact stated that while attempting to accelerate, the vehicle hesitated, jerked, and stopped unexpectedly. There were no warning lights illuminated. The vehicle was serviced by an independent mechanic who determined the failure was associated with DTC: P129F-00 (Fuel pump drive control module). The part was replaced. The contact stated that the vehicle was in a fleet of vehicles for the school district. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was contacted, and the contact was referred to the federal safety agency Hotline for assistance. The failure mileage was approximately 56,837.

Filed Oct 3, 2024 · Fuel system · HI

Fuel Pump Control Module failed in vehicle with only 26,000 miles. No warning light came on. No previous issue. Vehicle stalled while driving speed limit, all control of steering and braking was lost and vehicle did not restart. Needed to have vehicle towed. Vehicle was diagnosed by a dealership. Part unavailable, backordered and have been without vehicle for over 2 weeks. Awaiting invoice for repair

Filed Dec 6, 2023 · Fuel system · 5,000 miles · NH

The contact owns a 2021 Chevrolet Express. The contact stated while driving out of the driveaway, the vehicle shut off inadvertently and failed to restart. The vehicle was towed to the dealer, where it was diagnosed that the fuel pump control module had failed and needed to be replaced. The vehicle was repaired; however, the failure persisted. The contact stated while driving 75 MPH, the failure recurred. The contact was unable to pull to the side of the roadway. The vehicle was towed to a second dealer, Auto Gallery Chevrolet Buick GMC (1415 Lafayette Pkwy, LaGrange, GA 30241) and the contact was informed that the dealer could not repair the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that the vehicle would be towed to another dealer. The failure mileage was approximately 5,000.

Filed Sep 5, 2023 · Fuel system · SC

The fuel pump power control module in this vehicle has caused the fuel pump to fail or operate intermittently, interrupting the flow of fuel to the engine. When the engine does not receive adequate fuel, the vehicle has unexpectedly stalled. This has happened several times. At times has seen a check engine light or experienced a rough running engine. The vehicle may also be A vehicle stall without warning could increase the risk of a crash, especially at high speeds. This vehicle has been taken to a GM or Chevrolet service center twice for this problem. The first time, the fuel pump module was replaced. The second time, there was wiring that was bad that had to be traced down that was related to the fuel pump module failing. It has now happened a third time, while driving down the road, the vehicle suddenly shuts off. It has less than 5,000 miles on the engine. This vehicle has been out of service to the owners for an inordinate amount of time since ownership. It was in the shop 38 days the 2nd time. It is now taking a very long time with GM customer care for them to even find a place to work on it and to have it towed there. This has happened several times. I have created a log of events. I will enter the first time that this happened below and then provide other data.

Filed May 19, 2023 · Engine, Fuel system · MN

2008 Chevrolet Express van stalled while driving. I was able to coast over to the highway's shoulder. Van restarted after a few attempts and I resumed driving towards a small town ahead. Van re-stalled in the town. Attendant at small garage said the van had diagnostic codes for the fuel system. I was able to idle the van to a Chevrolet dealership for servicing. The dealership diagnosed and replaced the Fuel Pump Driver Module (part 20759945) (aka: Chassis Electronic Control Module) 17-days later, for about $650. Why wasn't I given notice and serviced under GM Recall Bulletin 14515 or 14515B, which specifies my van and that exact part? The dealership said my van is not part of that recall. the federal safety agency site says my van has no pending recalls. The problem is serious enough that the Recall Bulletin applies regardless of years or miles. Even if an affected vehicle came in for an oil change, it can't be released until 20759945 is replaced. Van now suffering from code for upset oxygen sensor. VAN IS SPECIFIED IN THE RECALL BULLETIN BUT WAS NOT ADDED TO THE DATABASE OF VEHICLES TO BE SERVICED! The contact stated that the dealership told them that the module failure "probably" did not ruin the catalytic converters. The contact said they would look into the issue within their home garage.

Filed Apr 29, 2023 · Fuel system · NY

While driving engine inexplicably shut off leaving us without power steering or brakes and unable to safely navigate off of the roadway. Fault: Fuel Pump Control Module GM representative stated they are seeing numerous failures of these components

Filed Dec 12, 2015 · Electrical, Engine · 25,900 miles · FL

Vehicle will shut off while driving. No warning signs. Will lose all power steering and unstable control. Will not start after it shuts down for up to 24hrs. This vehicle also has a history of hard/trouble starting. When it turns over is will go into protection mode "loss of power". This problem started at 3,178 miles and has continued regularly up to the current 26, 050 miles. Jack wilson chevrolet of saint augustine has attempted to repair this vehicle eleven (11) times since the 2nd day after purchase. After obtaining all service records since this vehicle was new there have been 24 attempts at repairing this vehicle with no success. Here is a list of repairs pulled from gm workbench service records. Continual check engine light. Dealer cannot find the issue. To date - I sold the vehicle back to dealer, they are selling, so it will be back on the road. List of services - 3,178 miles - engine block plug replacement 9,386 miles - roadside service battery test 9,400 miles - roadside service towing 9,404 miles - fuel tank fuel pump module replacement 9,692 miles - body wiring harness junction block replacement 14,398 miles - pass. Side instrument panel performance 14,434 miles - relay replacement 15,116 miles - connector reconnection 15,857 miles - ignition and start switch replacement 16,090 miles - engine control module replacement 16,090 miles - starter replacement 12 documented "check engine light" problems 6 documented times the vehicle stalled on the highway while driving 16 documented times vehicle would not start

Filed Aug 14, 2012 · Engine, Fuel system · ME

I have been dealing with gm head office and their call ctr for over 1 + years. I have been telling them that there is hesitation at the pedal at acceleration, constant noise from the engine - sounds like a machine gun. They are always telling me that these are "vehicle characteristics"!!!! I don't believe them! Then they put me on a oil consumption as I was almost out of oil for a 3 year old vehicle with only 40,000kms. They were monitoring this every 1,000 approx. I can smell gas in my oil, so they sent a sample off to cat, which they tell me everything was good, but I have never seen a report. Then all of a sudden I receive a I received a call regarding a "recalibrating", so I take the equinox back into the shop....they call me back and state that I had a leaking "high pressure fuel pump", which has mixed gas & oil. I am not stupid as gm thinks - this is not good! With gas mixing with your oil it changes the consistency and doesn't lubricate things like it should. Can this type of thing cause a "runaway"? I think all of these should be recalled - I have been reading alot of peoples words on-line and many are having the same issue - I really don't think people know where to turn. In closing, can you please advise if anyone else has filled reports on this vehicle, is there something more that should be done for me as I don't want to have a catastrophic failure with my family in the vehicle. Someone has to be responsible here and I think gm should be more concerned with their customers & lives. Thank you.