Search



Go Back   MustangForums.com > Ford Mustang Tech > Classic Mustangs (Tech)
Sign in using an external account
Register Forgot Password?
Search

Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 03-26-2008, 01:35 PM   #1
adr3naline
1st Gear Member
 
Join Date: Jun 2007
Location:
Posts: 134
Default Symptoms of a bad fuel pump?

What would be the symptoms of a bad fuel pump?
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________
adr3naline
1970 Mustang Coupe
302 4v C4 Transmission
Please visit My Web Site and My Blog
adr3naline is offline   Reply With Quote
Old 03-26-2008, 01:41 PM   #2
69thunder
2nd Gear Member
 
Join Date: Sep 2007
Vehicle: 1969 Coupe
Location:
Posts: 248
Default RE: Symptoms of a bad fuel pump?

No gas to carb..........they will just fail.
__________________
1969 Coupe
Factory A/C
Original sheet metal
New interior
347 stroker
Edelbrock RPM Heads and Cam
Summit Racing 4 Barrel carb
Pertronix/MSD 6a ignition
Doug Thorley long tube headers
Flowmaster Super 44's
69thunder is offline   Reply With Quote
Old 03-26-2008, 01:54 PM   #3
69thunder
2nd Gear Member
 
Join Date: Sep 2007
Vehicle: 1969 Coupe
Location:
Posts: 248
Default RE: Symptoms of a bad fuel pump?

I am guessing you are trying to address the earlier problems you have been having with your car? When was the last time the fuel filter was changed? Also, it could be too much fuel caused by a bad needle and seat or floats in the carb. I almost bought that car......glad I didn't.
__________________
1969 Coupe
Factory A/C
Original sheet metal
New interior
347 stroker
Edelbrock RPM Heads and Cam
Summit Racing 4 Barrel carb
Pertronix/MSD 6a ignition
Doug Thorley long tube headers
Flowmaster Super 44's
69thunder is offline   Reply With Quote
Old 03-26-2008, 02:02 PM   #4
adr3naline
1st Gear Member
 
Join Date: Jun 2007
Location:
Posts: 134
Default RE: Symptoms of a bad fuel pump?

Yeah, still trying to figure it out... I haven't had the problem happen again. I've tried to make it happen again in front of my house, but it seems it only wants to ruin my life when I'm far away from home.

When I start it up in the morning, it struggles to keep running for the first few minutes. I'm sure some people on this forum will just tell me to deal with it, since its a 40 year old car...

I took of my fuel filter to check it out... a bunch of brown/red crap came out (on the input end), and it was clean on the output... I'm hoping my tank isn't rusty, it's solid on the outside - top and bottom. I'll replace my filter tonight.

How's yours running?
__________________
adr3naline
1970 Mustang Coupe
302 4v C4 Transmission
Please visit My Web Site and My Blog
adr3naline is offline   Reply With Quote
Old 03-26-2008, 03:00 PM   #5
jlg2002
4th Gear Member

 
jlg2002's Avatar
 
Join Date: Jun 2006
Vehicle: 1966 Mustange coupe
Location: Fontana, California
Posts: 1,481
Default RE: Symptoms of a bad fuel pump?

Several actually:
They leak from the diaphram externally and internally (not good-it goes into the crankcase)
They don't produce enough volume.
They don't produce enough pressure.
Rarely will they produce too much pressure.

__________________
66 "C" code coupe bench seat
jlg2002 is offline   Reply With Quote
Old 03-26-2008, 03:36 PM   #6
ninteen66mustang
3rd Gear Member

 
Join Date: Dec 2007
Vehicle: 1966 Ford Mustang
Location: Colorado
Posts: 923
Default RE: Symptoms of a bad fuel pump?


Quote:
ORIGINAL: ririe44

Yeah, still trying to figure it out... I haven't had the problem happen again.┬* I've tried to make it happen again in front of my house, but it seems it only wants to ruin my life when I'm far away from home.┬*

When I start it up in the morning, it struggles to keep running for the first few minutes.┬* I'm sure some people on this forum will just tell me to deal with it, since its a 40 year old car...

I took of my fuel filter to check it out... a bunch of brown/red crap came out (on the input end), and it was clean on the output... I'm hoping my tank isn't rusty, it's solid on the outside - top and bottom.┬* I'll replace my filter tonight.

How's yours running?

I have had the same problem. Is your choke adjusted? What about your air/fuel mixture? Points gap set correctly?

Just a few things to think about that have been suggested to me or I have done to help the problem.
__________________
1966 Mustang Coupe w/ 302. C4. Fancy new interior. Unique (cheapo) wheels. More suspension upgrades than I can afford. Disc brakes. Dark Moss Green.
2005 Subaru Legacy GT- DD, SPT cold air intake, momo shift ****, STi pedals, and an HRC sticker . Obsidian Black Pearl.
ninteen66mustang is offline   Reply With Quote
Old 03-26-2008, 10:34 PM   #7
Cogtx
3rd Gear Member
 
Cogtx's Avatar
 
Join Date: Jul 2005
Vehicle: 1967
Location: Sugar Land, Texas
Posts: 565
Default RE: Symptoms of a bad fuel pump?

Quote:
ORIGINAL: ririe44
...

I took of my fuel filter to check it out... a bunch of brown/red crap came out (on the input end), and it was clean on the output... I'm hoping my tank isn't rusty, it's solid on the outside - top and bottom. I'll replace my filter tonight.

How's yours running?
Had probs with mine and rusty tank...did your fuel filter look like this? If so, might be rust getting into the carb and all those little inlet holes causing probs...



[IMG]local://upfiles/19071/2F42055E725E4C688433C09FE0941A80.jpg[/IMG]
__________________
Father and Son '67 Stang Project ongoin'
200ci I6 1v 3 spd
Cogtx is offline   Reply With Quote
Old 03-26-2008, 10:39 PM   #8
flyingfool
3rd Gear Member
 
Join Date: Oct 2006
Location:
Posts: 827
Default RE: Symptoms of a bad fuel pump?

this is kinda related, but sorry for slight change of subject. anyone know of a good rebuid kit for these kind of fuel pumps?
__________________
flyingfool is offline   Reply With Quote
Old 03-26-2008, 10:42 PM   #9
67t5ponycoupe
5th Gear Member

 
Join Date: Jan 2006
Vehicle: 1967 GT Coupe
Location: Colorado
Posts: 3,946
Default RE: Symptoms of a bad fuel pump?

Don't rebuild them you just replace them. they are cheap.
67t5ponycoupe is offline   Reply With Quote
Old 03-27-2008, 12:27 AM   #10
Gun Jam
Moderator

 
Gun Jam's Avatar
 
Join Date: Dec 2005
Location: Hills of California
Posts: 4,336
Send a message via ICQ to Gun Jam Send a message via AIM to Gun Jam Send a message via Yahoo to Gun Jam
Default RE: Symptoms of a bad fuel pump?

My fuel pump stared to lose volume when it was going bad. It would produce 6psi no problem. At full power accelerations from 1st gear it would run great but pressure would be about 2psi before the shift into 2nd gear. as soon as you hit 2nd gear the fuel pressure would drop to 0 and about 3 seconds later the car would lose power and would produce only about 25% of its rated Hp. As long as you kept your foot into it would continue to run like crap. You would have to back off the gas for about 5 to 7 seconds before the system would recharge with fuel giving you about another 10 seconds worth of WOT before it would do the same crap again.

-Gun
__________________

Masters of Industrial Technology intelligence thats why I own guns made to drop elephants.
Gun Jam is offline   Reply With Quote
Old 03-27-2008, 12:27 AM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
1966, 1970, 69, bad, c4, change, coupe, filter, fuel, gear, mustang, pump, symptoms, transmission, volume

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
signs of a bad fuel pump?? grabbem88 5.0L (1979-1995) Mustang 20 12-19-2004 07:20 PM

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 11:39 PM.

ę Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford« is a registered trademark of the Ford Motor Company
Emails Backup