Fuel Pump Buzzing - Off-Road Forums & Discussion Groups
Ford 67-96 F-Series, 78-96 Bronco All discussions of 67-96 F-Series Trucks and 78-96 Broncos

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 12-29-2002, 10:25 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Fuel Pump Buzzing

95 Bronco XLT, 302, 120,000 miles.

Iíve got a buzzing (not the usual whine) from the in tank pump. No codes and the truck runs fine. Does this indicate pump failure or could this be something else like the pressure regulator?

Thanks,

Mike
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 12-29-2002, 10:26 PM
froggy
Guest
 
Posts: n/a
Re: Fuel Pump Buzzing

HUH , dunno. I always thought you should here a little something back there. How loud is it and does it sound like grinding or something?
post #3 of (permalink) Old 12-30-2002, 08:54 AM
 
Join Date: Jul 2002
Posts: 908
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Fuel Pump Buzzing

Do a search when it comes back up I know there are a ton of threads on this. I know that the electric in tank fuel pumps on the bronco seem to be a high fail item so much so that a few of the guys have gone and cut an access dr to the fuel tank in the rear bed. I would bet that it is going bad.... of course I guess depepinding on how you look at it they start going bad the day they start working [img]images/graemlins/grin.gif[/img]
80BRONCO is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 12-30-2002, 09:13 AM
Shilo
Guest
 
Posts: n/a
Re: Fuel Pump Buzzing

If you believe the sound has changed significantly then it could be wise to r&r it, but these pumps make noise regardless.
post #5 of (permalink) Old 12-30-2002, 01:12 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Fuel Pump Buzzing

Shilo,

Thanks for the reply. A change in the noise is definitely what triggered my post. The sound went from a whine (which I think is normal) to an intermittent buzzing (bearing?). Itís been suggested that I run a pressure test to eliminate the regulator. Iím going to buy a gauge and try that. However, according to some on this and other forums this whining/buzzing isnít necessarily a problem. Iíll get back.

Thanks again,

Mike
post #6 of (permalink) Old 12-30-2002, 02:01 PM
Shilo
Guest
 
Posts: n/a
Re: Fuel Pump Buzzing

I'd put zero stock in a pressure test even if it comes back good (if it comes back bad something is clearly wrong). These pumps generally fatigue and will fail under high temps or heavy loads, but when cold or recovered or at idle or whatever they'll *appear* to work fine, and produce pressures within spec.

IOW, a normal pressure test does not mean your pump is not waiting to become intermittent.

All I can tell you is my Napa replacement buzzes louder than the dying OEM, but it's worked great for 3+ years, under heavy loads at high altitudes. I still carry a trail spare, tho.
post #7 of (permalink) Old 12-31-2002, 07:20 PM
Mud in my Veins
 
Steve83's Avatar
 
Join Date: Dec 2000
Location: Memphis, TN
Posts: 5,301
Thanks: 0
Thanked 0 Times in 0 Posts
 
Fuel Pump load

The pressure regulator keeps the load on the pump almost the same all the time. The only time it changes is in those moment before the regulator has time to react, which means it works less when you stomp the gas (injectors open, dropping the pressure), and more when you suddenly let off (pressure jumps).

Considering the minute amount of heat generated by the motor, the volatile nature of gasoline, and the fact that a boiling liquid will not increase its temperature, you can bet that the pump never gets significantly warmer or cooler, except for the few moments before it runs totally dry. Otherwise, it's gonna be the same temp as the gas in the tank, which is flowing thru & around it.
Steve83 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome