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04-18-2026, 08:39 PM
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#1 |
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Craig
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Peterborough, ON Canada
Posts: 443
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Fuel Pump not priming?
So went to unlock the car today (it’s been on a trickle charger like every year for winter) and when I did usually you’ll hear the fuel pump prime but this time it was just the doors unlocking, opened the door and no prime either and even turned it to ACC and it didn’t prime. Anyone else ran into this issue before? Not sure if it’s a relay, the battery is OEM from 2019 but this is also the first winter since the build so not sure if there’s a draw on it from the DSX aux pump or something?
Didn’t try cranking it over yet
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04-19-2026, 09:39 AM
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#2 |
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Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 5,181
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Not sure if the pump will prime in ACC, might need to push the button again (foot off the brake pedal) to get the car into KEY-ON mode for the pump to do the 2 second prime.
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04-19-2026, 09:55 AM
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#3 |
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Craig
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Peterborough, ON Canada
Posts: 443
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Usually it primes as soon as I unlock the car or open the door it’s always done that.
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04-19-2026, 12:03 PM
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 982
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Quote:
That is not normal operation. The factory fuel pump primes at key on engine off. If you have an aux pump, it can be rigged up however and if someone rigged it up to work that way then that's wrong. You might want to specify if you are talking about the in tank set up or you are talking about the aux pump.
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ  |
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04-19-2026, 12:17 PM
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#5 |
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Craig
Drives: 2019 ZL1 1LE Join Date: Jan 2019
Location: Peterborough, ON Canada
Posts: 443
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The factory pump primes when you unlock the car or open the drivers door to pressurize the fuel lines.
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04-19-2026, 02:30 PM
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#6 |
 
Drives: 2019 1SS M6 Join Date: Feb 2020
Location: Harrisburg,Pa.
Posts: 120
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You're on the right track...Relay, fuse or door latch sensor might be some initial checks..
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1st Gen ground effects kit GBA black | Mamo V3 ported TB | GM CAI | Velossa Ram Air | AWE touring axle back| Xpel PPF | illuminated door sills | Upgraded door panels with spectrum lighting |ZZP pillar pod with Banks Idash pro/AEM wideband
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04-19-2026, 03:14 PM
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 982
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Quote:
Yeah that's definitely not normal. I wonder if you may be having an issue with you FPDCM which is located under the car by the diff. You don't hear many stories about them going but they have in the past and can go. Luckily they are easily obtainable (seriously, you can get them from O'Reilly's or AutoZone) from local parts stores without much issue. Going to have to bust out the diagnostics on this one brotha. I'm sorry you're having these issues.
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ |
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04-19-2026, 04:54 PM
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#8 | |
     
Drives: 2017 2ss 6mt Join Date: Mar 2024
Location: dallas
Posts: 1,537
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Quote:
Does the car not start? If the pressure is already within its desired pressure it wont prime. |
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04-22-2026, 02:41 PM
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#9 |
Drives: 2023 ZL1 Join Date: Dec 2022
Location: Columbus, Ohio
Posts: 1,272
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When I bought my car brand new, I often noticed when I would unlock the doors or open a door (if it wasn't locked) or the trunk. It would make a noticeable swoosh sound. A few days later after hearing it off and on over the weekend. I called my sales guy and asked why sometimes did my car make that sound. He told me that it is pressurizes the fuel system, it does that if the car has been off for a lengthy period of time. So, I can confirm my car did make this sound when it was new before any work was ever done to it.
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Katech Track Day CAM 38%•BTR Dual Valve Springs-Johnson Lifters•Trend 3/8 Chromoly Pushrods• VVT Del•CNC Ported Heads•AFM Delete• C5-R Timing Chain•Katech Oil Pump•Katech 112mm•Maggie 2650 3.25” Upper & ATI SD w/10.32” +20%•10 Rib Belt•RFBG•FI Interchiller Stage 2•THPSI Port w/875cc Inj•Dual Drop In Fuel Pump•DSX Aux Pump•Stainless Works 2" w/Legend NPP Axle Back•GESI UHO 4.5" CATs•Brisk RR14S Plugs•BMR Motor Mounts•BMR Cradle Lockout/Bushings Kit•DSS Chromoly DS•RPM 8-Point Roll Cage•10lb FireSense+ w/4Fire SFI 17.1 Fire Sys•Weld Forged Vitesse Rear 17x10 Beadlocks-Front 18x6•Unlocked TCM
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04-22-2026, 08:30 PM
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#10 | |
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 982
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Quote:
Oh yes it does my brother... K2 relay which drives the FPDCM to turn on and off which drives the fuel pump, and two fuses in the rear. The pump itself does not have direct fuses for it but it does have fuses for the FPDCM that is by the diff which are under the the trunk mat. It's fuse 35 and 46.
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ Last edited by ZLRob; 04-22-2026 at 09:02 PM. |
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