fuel pump noise thru speaker
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=33796
Printed Date: July 12, 2025 at 5:42 PM
Topic: fuel pump noise thru speaker
Posted By: warlok_ebk
Subject: fuel pump noise thru speaker
Date Posted: June 13, 2004 at 12:32 PM
i hear my fuelpump thru my subs why? and how can i stop it ?:errr: there powered by a 200watt amp.
Replies:
Posted By: mikedawg
Date Posted: June 13, 2004 at 11:08 PM
good question. youll want to take a day off to figure it out. first take a look at your ground. make sure its as close to the chassis as possible. usually the bottom of your trunk is good. then if thats not it, make sure your rca cables are not ran next to the power wire. its always a good idea to run the power on one side of the car and the rcas on the other side. its probably one of those. if not, just come back on here and youll get some more help.
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Posted By: Ravendarat
Date Posted: June 14, 2004 at 12:12 AM
are you hearing your fuel pump or your altenator.If its your altenator than it is almost always related to your ground wire. Make sure it goes to an unpainted surface of the car, prefurably some place with double metal. DO NOT USE ANY PRE-EXISTING BOLTS. I see nebies do this all the time and it drives me insane. Its never a good Idea and very rarly a good ground. Its kinda uncommon to hear really bad ground noise through your sub unless the ground is exceptionally bad. If you are hearing a popping noise through the sub then I suggest you check your ignition system such as your cap, spark plugs and plug cables. Look for pin holes and what not in the cables. Also try regrounding your battery and altenator as the factory ground usually suck.
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: mikedawg
Date Posted: June 14, 2004 at 2:00 PM
true about the stock ground. the best ground in the whole car is at the alternator. its good to upgrade the actual factory ground wire too. they give you a 4 guage from the alternator to the battery but stick you with a 10 guage ground wire.
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always looking for new info and willing to give it
Posted By: DYohn
Date Posted: June 14, 2004 at 2:07 PM
How do you know it's your fuel pump? Was it recently replaced? ------------- Support the12volt.com
Posted By: warlok_ebk
Date Posted: June 16, 2004 at 9:35 PM
ok what i have going here is a 85 ford mustang that was striped down . 351w (130amp alt) i made a new wire harness change fuelpump from intank to one that is inline . i have ground strap block to frame #4wire bat- to block#2 to frame #8 i have {1- headlite circuit } {1circuit brake lites running turn flasher) 1 circuit that is hot in run and acc that feeds a fuseblock for radio and inside lite and dash fuelpump is on it own circuit amp feed from bat + on #8 ground to body about 8 in from amp with # 10
Posted By: auex
Date Posted: June 16, 2004 at 9:38 PM
If your crossover was set correcly then there is no way in hell you can possible hear engine noise or alternator whine through your sub, it is a higher frequency that will not pass through a low pass filter.
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Posted By: warlok_ebk
Date Posted: June 16, 2004 at 9:41 PM
oops and a msd ignition all guages are after market spitfire all connection where tined and joined and srinkwraped i am going to try a 1way diode in the line to the pump
Posted By: warlok_ebk
Date Posted: June 16, 2004 at 9:47 PM
all i no is that no amp running i hear it but that just cuz it makes noise but hook amp up you hear it like you had a mic next to it i dunno i am going to check all the runns make sure nothing got missed up and redo it again i guess
Posted By: DYohn
Date Posted: June 16, 2004 at 9:56 PM
Ground the pump body with a dedicated ground strap and see if that helps. Plus, be aware that with your high energy ignition system you may get uncontrollable ignition noise that cannot be taken out of the system. (Sometimes if you're trying to build a hot rod, you just can't put high-end audio gear into it and keep the engine goodies you want too.) ------------- Support the12volt.com
Posted By: warlok_ebk
Date Posted: June 17, 2004 at 12:33 PM
1st i want to say thank you for all the help you guys are great. and i grounded right to pump and did better alt ground and now its fine as frog hair.thank you again  
Posted By: DYohn
Date Posted: June 17, 2004 at 12:36 PM
Cool! Glad it worked. ------------- Support the12volt.com
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