Well, you all heard my "knowing the tow guy by name" story. The problem I had with a buzzing fuel pump has returned!
Last time, it left me stranded in a questionable part of town.
The buzzing sound went away after installing the new fuel pump (I used to get a loud buzz from the back when acclerating anywhere over 60mph), the idle was silky smooth, and things were going great.
Then the fuel control module fried. So my mechanic installed a new control module and a new fuel filter. But after a couple days the buzzing came back when accelerating over 60mph, and the idle is somewhat rough again. When cruising at 60mph and up, there is no buzzing. Only when I push the gas pedal.
What could be the cause of all this? I have a road trip planned this summer and I'm worried about being an asian guy stranded alone in some town full of heavily armed country bumpkins.
Thank you-J.
Still Buzzing
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Pretty foolish to change pumps and not look in the tank for trash or purge the fuel lines and replace the filter.Dirt can hide just waiting to chew up a brand new pump.
The voltage on the pump is a function of engine load [how far you push the accelerator]!
One should examine the current waveform feeding the pump to look for dirty commutators and measure the pump speed.
As to why the controller failed the worn 1st pump marginalized it and the new pump did it in.
As I keep pointing out my controller has out lasted 3 fuel pumps, but the pumps were changed BEFORE they failed!
The voltage on the pump is a function of engine load [how far you push the accelerator]!
One should examine the current waveform feeding the pump to look for dirty commutators and measure the pump speed.
As to why the controller failed the worn 1st pump marginalized it and the new pump did it in.
As I keep pointing out my controller has out lasted 3 fuel pumps, but the pumps were changed BEFORE they failed!
Thanks. I'll be sure to call my regular mechanic and let him know he's a fool.
On a more practical note, is there anything I can do now to clean out the fuel system and save my pump (and my money)? Or should I start from scratch with a new pump now and flush the fuel lines? I think I still have time to return the part.
On a more practical note, is there anything I can do now to clean out the fuel system and save my pump (and my money)? Or should I start from scratch with a new pump now and flush the fuel lines? I think I still have time to return the part.
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autotech43
- Posts: 130
- Joined: Sat Jan 04, 2003 2:14 pm
One other thing you might want to have checked is the fuel pressure regulator, make sure they have vacuum when the engine is at idle speed and the hoses are attached and not cracked or leaking vacuum. Rare, but have seen an occasion where this can cause the pressure to boost at idle speed along with a slight fuel pump hum! Just another suggestion.