Fuel Pump slows down when Headlights are on. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Powered by Jay · 08-18-2007, 12:57 AM

Does anyone else notice their fuel pump slowing down when you turn on your headlights? I have a walbro hp fuel pump so it was easy to hear. When I switch the headlights on the walbro sound drops a note.
Could it be my alternator not providing enough current or is this normal?

!Zar! · 08-18-2007, 10:27 AM

Sounds like your alternator isn't putting out proper amperage.

I'd also suggest hardwiring your fuel pump if you haven't.

**ThatGuy** · 08-18-2007, 10:34 AM

Welcome to Nissan wiring.

I too would suggest checking your Alternator, re-wiring your pump, and double checking every ground you find just for good measure.

!Zar! · 08-18-2007, 10:38 AM

After working on others cars, nissian wiring is great.

**ThatGuy** · 08-18-2007, 10:42 AM

Oh, I'm not saying it awful. Just that most of these cars have a few years and many miles under their belts. Grounding points seem to be the first to go. That's all.

Perhaps I just worded myself poorly.

jobestudios · 08-18-2007, 10:54 AM

I hope if you guys are hardwiring your fuel pumps you are at least using a safety relay.

08-19-2007, 07:06 AM

Quote:

Originally Posted by Powered by Jay

Does anyone else notice their fuel pump slowing down when you turn on your headlights? I have a walbro hp fuel pump so it was easy to hear. When I switch the headlights on the walbro sound drops a note.
Could it be my alternator not providing enough current or is this normal?

why not put a volt-meter to it and check the voltage its receiving. check your battery post, and also check your alternator output.

this is not something you just wonder about, this is something that you TEST, my friend, with a meter.

jobestudios · 08-19-2007, 12:37 PM

Quote:

Originally Posted by ixfxi

why not put a volt-meter to it and check the voltage its receiving. check your battery post, and also check your alternator output.

this is not something you just wonder about, this is something that you TEST, my friend, with a meter.

Well thats just a crazy notion...

UNISA JECS · 08-19-2007, 03:02 PM

Quote:

Originally Posted by jobestudios

Well thats just a crazy notion...

No...thats just flat out un-zilvian!

08-18-2007, 12:57 AM	#1
Powered by Jay Zilvia Junkie Join Date: May 2003 Location: La Crescenta, CA Posts: 384 Trader Rating: (4) Feedback Score: 4 reviews	Fuel Pump slows down when Headlights are on. Does anyone else notice their fuel pump slowing down when you turn on your headlights? I have a walbro hp fuel pump so it was easy to hear. When I switch the headlights on the walbro sound drops a note. Could it be my alternator not providing enough current or is this normal?

08-18-2007, 10:27 AM	#2
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	Sounds like your alternator isn't putting out proper amperage. I'd also suggest hardwiring your fuel pump if you haven't. __________________

08-18-2007, 10:34 AM	#3
ThatGuy Admin Asshole Join Date: Mar 2002 Location: Retired Age: 45 Posts: 20,394 Trader Rating: (0) Rides Gallery: ThatGuy Feedback Score: 0 reviews	Welcome to Nissan wiring. I too would suggest checking your Alternator, re-wiring your pump, and double checking every ground you find just for good measure. __________________ "Speak softly,..." -Pres. Teddy Roosevelt "Be polite, be professional, ..." -Gen. James Mattis

08-18-2007, 10:38 AM	#4
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	After working on others cars, nissian wiring is great. __________________

08-18-2007, 10:42 AM	#5
ThatGuy Admin Asshole Join Date: Mar 2002 Location: Retired Age: 45 Posts: 20,394 Trader Rating: (0) Rides Gallery: ThatGuy Feedback Score: 0 reviews	Oh, I'm not saying it awful. Just that most of these cars have a few years and many miles under their belts. Grounding points seem to be the first to go. That's all. Perhaps I just worded myself poorly. __________________ "Speak softly,..." -Pres. Teddy Roosevelt "Be polite, be professional, ..." -Gen. James Mattis

08-18-2007, 10:54 AM	#6
jobestudios Zilvia Junkie Join Date: Sep 2005 Location: Bellingham Posts: 349 Trader Rating: (1) Feedback Score: 1 reviews	I hope if you guys are hardwiring your fuel pumps you are at least using a safety relay. __________________ -Jackson.Vaughn.Photography-