weird noise

[desertbronc]

ok i turned the ignition on on my bronco and this horrible buzzing sound is coming from this thing that is above the rear tire on the driver side on the frame. i checked my book cuz i though it was my fuel pump, but apparantely it is not. the book says the pump is located in the engine bay. so i am just really confused. does anyone know what this is it appears to be coming from there. u can hear it even if u are sitting inside.

also can someone tell me what is the computer looking thing under my drivers seat. thanx

 

[Broncobill78]

Nope, books's wrong, unless of course yo uhave an early 80's carb'd Bronco (lose the Haynes & Chilton's books & get one of the factory manuals published by Helm Inc. http://www.helminc.com/helm/homepage.asp?r...als+publishing+ They're often found on Ebay for reasonably $$$. They aren't as cheap as a Chilton's but then they aren't nearly as wrong or incomplete either)

You have two fuel pumps (unless you have a 93-96 (I think)) one is the low pressure pump located in the fuel tank and that one pressurizes the system and then a second high-pressure pump located near the transfer case on the drivers side framerail. The only fuel pumps located under the hood are mechanical pumps for carb'd engines and those are mounted low on the front end/driver's

You can usually hear the fuel pump prime for a few seconds when you first turn the key to the "on" position but once the line is pressurized it usually quiets down.

I've seen possts about that blk box under the drivers seat & I think the consensus was that it's anti-theft related. The engine computer is located behind the kick panel, the doohickey under the seat is either stereo or anti-theft related I believe.

 

[desertbronc]

yeah sorry i forgot to mention its a carburated 82.

 

[desertbronc]

and how do i know if i got power brakes or manual

 

[miesk5]

Use a length of garden hose, etc. to track down that noise and post a pic of that thAng; guessing...emergency brake cable/bracket....fuel filler hose/etc. vibrating....

power brake booster - look for larger circular metallic "pan" between firewall and master cylinder; like this one

Source: by Trent

http://www.supermotors.net/getfile/519801/...ze/img_0717.jpg

& a general article too w/pics; http://neptune.spacebears.com/cars/stories/booster.html

 

[desertbronc]

ok i got power brakes, thanx.

This is te item that makes the horrible buzzing:

 

[Roadkill]

That appears to be a fuel pump, but I have never seen one mounted outside the frame or in a wheel well. Not a good location at all. That is definately not original equipment. (At least I don't think it is, I'm sure someone will correct me if I'm wrong) What year is your truck? If your book says the pump is in the engine bay, then I'm guessing it is an older carburated model that would have originally had a mechanical fuel pump on the side of the engine. Perhaps a previous owner converted to an electric pump for some reason?

 

[desertbronc]

im thnking its like a pre-pump. a line goes from the tank to this thing, yeah its kind of a bad spot. i should move it to the inside rail huh.

 

[miesk5]

yeah...

btw, here is another owner mod by a good pal

JEG's fuel system Installation Info & pics, 15 Gallon in an 84 Source: by Richard C (Bigric, Money Pit)

 

[miesk5]

some info; may be appl to that pump and save u some $$$

AUG 27, 2007 | Recall ID# 53191 Hide Details

Recall Reason FUEL SYSTEM, GASOLINEELIVERY:FUEL PUMP

Recall Date AUG 27, 2007

Model Affected BRONCO

Potential Units Affected 34000

Recall Summary

CERTAIN FEDERAL-MOGUL AFTERMARKET FUEL PUMPS SOLD UNDER THE BRAND NAMES OF CARTER, ACCUFLOW, NAPA, TRUFLOW, PARTS DEPO, AND PARTS MASTER, SHIPPED BETWEEN AUGUST 2006 AND JULY 2007 FOR USE ON THE VEHICLES LISTED ABOVE. THE FUEL PUMP DIAPHRAGM IN CERTAIN PRODUCT RUNS MAY HAVE BEEN IMPROPERLY INSTALLED OR INADEQUATELY TESTED WHICH MAY CAUSE THE FUEL PUMP TO LEAK.

Consequence

A LEAKING FUEL PUMP COULD CREATE A VEHICLE FIRE HAZARD.

Remedy

FEDERAL-MOGUL WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE FUEL PUMPS FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN DURING SEPTEMBER 2007. OWNERS CAN CONTACT FEDERAL-MOGUL AT 248-354-7700.

Notes

FEDERAL-MOGUL CORPORATION

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[miesk5]

a typical FM Carter electr fp that looks = to your pic...

http://www.federal-mogul.com/en/Aftermarke...mps/RotaryVane/