Buzzing from rear of car & low fuel pressure - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

fab410 · 06-09-2016, 09:28 PM

Hey guys, I'm trying to pin point an issue and was wondering if anyone has had any similar issues before. I have a Squash Dual Pump set up with Hobbs Switch as well. The car has only put no more than 3-4K miles on it (if that) with the twin pump set up installed. Went to start the car a few days ago (since I hadn't started in over a week with low fuel) and started fine. Went to fill the tank, grab some dinner and everything was still fine. The next day, turned the ignition on and now I have this sound in the video. I also noticed my fuel psi is around 20psi with ignition on, I'm used to seeing around 40-50. I attempted to swap filters and that still didn't resolve the issue. Any feedback would be helpful !

https://vimeo.com/170109832

Unreal · 06-09-2016, 10:01 PM

Trouble shoot one pump at a time. Either pump alone should be able to provide enough pressure at idle and low boost. Try swapping the wiring to rule out the main pump dying. The start checking for leaks or issues with the fuel components. Could be a bad regulator, or something came loose with the squash setup.

fab410 · 06-09-2016, 10:03 PM

I appreciate it, that's what Andy advised next is swapping the wiring to determine if one is dying.

fif_gen_powa · 06-09-2016, 11:33 PM

sounds like bad pump. easiest way would be disconnect the ground wire off relay 1 for pump 1 to turn it off and ground the wire normally from the hobbs switch to relay 2 turn on pump 2

1KillerSS · 06-09-2016, 11:41 PM

How low was the tank, before you filled it up?

fab410 · 06-10-2016, 08:10 AM

Thank guys, @1killerSS less than a quarter but not on E

fab410 · 06-10-2016, 09:13 AM

Ok so disconnected 1 wire from the positive terminal on the battery and buzzing still remained, still 20psi and car started but still makes buzzing noise.

I disconnected that cable and connected the other, no buzzing, 0psi and no start

Unreal · 06-10-2016, 09:19 AM

Maybe out of fuel.

Got to remember with aftermarket systems, the gauge may not read the same anymore. Sounds like you were just out of gas. Fill it up and go from there.

And you need to put power direct to the 2nd pump, or jump the hobbs switch, otherwise it won't turn on doing it that way.

fab410 · 06-10-2016, 09:21 AM

Problem is, it's almost a full tank right now

. The day that I started it with low fuel, i grabbed gas (filled it up) and drove about 10 miles to grab dinner. No issues that night, the next morning is when the problem occurred.

Unreal · 06-10-2016, 09:43 AM

May have ran a pump dry, and hurt it. With aftermarket systems, have to be careful about that.

Sounds like a dying pump. Swap which pump is #1 and which is #2.

06-09-2016, 10:03 PM	#3
fab410 @fabSSbuild on IG Drives: 2012 Twin Turbo Super Sport Join Date: Aug 2011 Location: Arlington, VA Posts: 864 View My Garage	I appreciate it, that's what Andy advised next is swapping the wiring to determine if one is dying. __________________ AGP Twin Turbo, FAST lsxR manifold, ID850's, Squash Return Style Fuel System, ZL1 Bumper/Side Skirts/Hood/Carbon Insert, Havoc Rear Diffuser, PFADT Coilovers/Sway Bars/Adj. Tie Rods/Solid Subframe Bushings/Trailing Arms, Eboost2, SW Retro Chambered 3" Catback, R1 Concept Drilled/Slotted Rotors, 360 Forged Straight 5's, Matte Metallic Purple Wrap, Anvil Carbon Spoiler, Full AAC Lighting, etc

06-09-2016, 11:33 PM	#4
fif_gen_powa Drives: 2013 Camaro SS Turbo Join Date: Apr 2014 Location: South Florida Posts: 1,525	sounds like bad pump. easiest way would be disconnect the ground wire off relay 1 for pump 1 to turn it off and ground the wire normally from the hobbs switch to relay 2 turn on pump 2 __________________ 388ci 91/104 Turbo TH400 8.3@164 https://instagram.com/turbo_ls3/

06-09-2016, 11:41 PM	#5
1KillerSS Too much is never enough! Drives: AGP TT SS [COTW] 4/20/15 Join Date: Feb 2014 Location: Toledo,OH Posts: 4,149 View My Garage	How low was the tank, before you filled it up? __________________ AGP TT kit, 54/57 Forged rotating assembly, Custom grind cam... Dual nozzle meth, ID850's, Livernois dual fuel pumps, ECS BAP, 25% UDP, 3 inch Magnaflow catback with X pipe, Mantic 9000 clutch, DSS 1000hp axles, DSS aluminum driveshaft, ZL1 rear end, solid subframe bushings, HE differential offset bushings, BMR Trailing arm, BMR toe rods, Lingenfelter LNC-2000,SJM Line Lock. 747 whp 714wtq *Build thread* http://www.camaro5.com/forums/showth...55#post8107855

06-10-2016, 08:10 AM	#6
fab410 @fabSSbuild on IG Drives: 2012 Twin Turbo Super Sport Join Date: Aug 2011 Location: Arlington, VA Posts: 864 View My Garage	Buzzing from rear of car & low fuel pressure Thank guys, @1killerSS less than a quarter but not on E __________________ AGP Twin Turbo, FAST lsxR manifold, ID850's, Squash Return Style Fuel System, ZL1 Bumper/Side Skirts/Hood/Carbon Insert, Havoc Rear Diffuser, PFADT Coilovers/Sway Bars/Adj. Tie Rods/Solid Subframe Bushings/Trailing Arms, Eboost2, SW Retro Chambered 3" Catback, R1 Concept Drilled/Slotted Rotors, 360 Forged Straight 5's, Matte Metallic Purple Wrap, Anvil Carbon Spoiler, Full AAC Lighting, etc Last edited by fab410; 06-10-2016 at 09:11 AM.

06-10-2016, 09:13 AM	#7
fab410 @fabSSbuild on IG Drives: 2012 Twin Turbo Super Sport Join Date: Aug 2011 Location: Arlington, VA Posts: 864 View My Garage	Ok so disconnected 1 wire from the positive terminal on the battery and buzzing still remained, still 20psi and car started but still makes buzzing noise. I disconnected that cable and connected the other, no buzzing, 0psi and no start __________________ AGP Twin Turbo, FAST lsxR manifold, ID850's, Squash Return Style Fuel System, ZL1 Bumper/Side Skirts/Hood/Carbon Insert, Havoc Rear Diffuser, PFADT Coilovers/Sway Bars/Adj. Tie Rods/Solid Subframe Bushings/Trailing Arms, Eboost2, SW Retro Chambered 3" Catback, R1 Concept Drilled/Slotted Rotors, 360 Forged Straight 5's, Matte Metallic Purple Wrap, Anvil Carbon Spoiler, Full AAC Lighting, etc

06-09-2016, 09:28 PM	#1
fab410 @fabSSbuild on IG Drives: 2012 Twin Turbo Super Sport Join Date: Aug 2011 Location: Arlington, VA Posts: 864 View My Garage	Buzzing from rear of car & low fuel pressure Hey guys, I'm trying to pin point an issue and was wondering if anyone has had any similar issues before. I have a Squash Dual Pump set up with Hobbs Switch as well. The car has only put no more than 3-4K miles on it (if that) with the twin pump set up installed. Went to start the car a few days ago (since I hadn't started in over a week with low fuel) and started fine. Went to fill the tank, grab some dinner and everything was still fine. The next day, turned the ignition on and now I have this sound in the video. I also noticed my fuel psi is around 20psi with ignition on, I'm used to seeing around 40-50. I attempted to swap filters and that still didn't resolve the issue. Any feedback would be helpful ! https://vimeo.com/170109832 __________________ AGP Twin Turbo, FAST lsxR manifold, ID850's, Squash Return Style Fuel System, ZL1 Bumper/Side Skirts/Hood/Carbon Insert, Havoc Rear Diffuser, PFADT Coilovers/Sway Bars/Adj. Tie Rods/Solid Subframe Bushings/Trailing Arms, Eboost2, SW Retro Chambered 3" Catback, R1 Concept Drilled/Slotted Rotors, 360 Forged Straight 5's, Matte Metallic Purple Wrap, Anvil Carbon Spoiler, Full AAC Lighting, etc

06-09-2016, 10:01 PM	#2
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Trouble shoot one pump at a time. Either pump alone should be able to provide enough pressure at idle and low boost. Try swapping the wiring to rule out the main pump dying. The start checking for leaks or issues with the fuel components. Could be a bad regulator, or something came loose with the squash setup. __________________ Nick Corvette Z06 -1200ish rwhp

06-10-2016, 09:19 AM	#8
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Maybe out of fuel. Got to remember with aftermarket systems, the gauge may not read the same anymore. Sounds like you were just out of gas. Fill it up and go from there. And you need to put power direct to the 2nd pump, or jump the hobbs switch, otherwise it won't turn on doing it that way. __________________ Nick Corvette Z06 -1200ish rwhp

06-10-2016, 09:21 AM	#9
fab410 @fabSSbuild on IG Drives: 2012 Twin Turbo Super Sport Join Date: Aug 2011 Location: Arlington, VA Posts: 864 View My Garage	Problem is, it's almost a full tank right now . The day that I started it with low fuel, i grabbed gas (filled it up) and drove about 10 miles to grab dinner. No issues that night, the next morning is when the problem occurred. __________________ AGP Twin Turbo, FAST lsxR manifold, ID850's, Squash Return Style Fuel System, ZL1 Bumper/Side Skirts/Hood/Carbon Insert, Havoc Rear Diffuser, PFADT Coilovers/Sway Bars/Adj. Tie Rods/Solid Subframe Bushings/Trailing Arms, Eboost2, SW Retro Chambered 3" Catback, R1 Concept Drilled/Slotted Rotors, 360 Forged Straight 5's, Matte Metallic Purple Wrap, Anvil Carbon Spoiler, Full AAC Lighting, etc

06-10-2016, 09:43 AM	#10
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	May have ran a pump dry, and hurt it. With aftermarket systems, have to be careful about that. Sounds like a dying pump. Swap which pump is #1 and which is #2. __________________ Nick Corvette Z06 -1200ish rwhp