Fuel pump relay shutting off right after key on. - Ford Truck Enthusiasts Forums

Go Back  Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Engine Swaps
Reload this Page >

Fuel pump relay shutting off right after key on.

Notices

Fuel pump relay shutting off right after key on.

 
  #1  
Old 07-14-2008, 12:08 AM
Hawkeye58
Hawkeye58 is offline
Senior User
Thread Starter
Join Date: Jan 2002
Location: Las Vegas
Posts: 207
Hawkeye58 is starting off with a positive reputation.
Fuel pump relay shutting off right after key on.

Hi all,

I am trying to finish wiring up a 2.9 L I put in '84 BII. The 2.9 is from a '88 BII.
When I turn on the ignition I hear the ECM relay, and the fuel pump relay. But... the fuel pump relay shuts off after about 2-3 seconds. Any ideas on this? I thought it should stay on.
I just installed the relay as well. It seems the old one blew up, along with my fuel pumps. I get good continuity and power to the harness. Just get that odd behavior. I will be replacing the fuel pumps both on the rail and in the tank in a few days when I have the money. Any insight on this would be much appreciated. Thanks.

Hawkeye
 
  #2  
Old 07-17-2008, 09:07 PM
baldboyford
baldboyford is offline
Senior User
Join Date: Jan 2006
Location: Brinkhaven, OH
Posts: 255
baldboyford is starting off with a positive reputation.
Do you actually hear the relay clicking off or does the fuel pump just stop running after 2-3 seconds?
 
  #3  
Old 07-17-2008, 09:31 PM
EPNCSU2006's Avatar
EPNCSU2006
EPNCSU2006 is offline
Post Fiend
Join Date: Nov 2002
Location: Concord, NC
Posts: 9,437
EPNCSU2006 has a great reputation on FTE.EPNCSU2006 has a great reputation on FTE.EPNCSU2006 has a great reputation on FTE.EPNCSU2006 has a great reputation on FTE.
It's supposed to do that. It will click back on as soon as the computer senses that the engine is turning.
 
  #4  
Old 07-17-2008, 09:36 PM
baldboyford
baldboyford is offline
Senior User
Join Date: Jan 2006
Location: Brinkhaven, OH
Posts: 255
baldboyford is starting off with a positive reputation.
Originally Posted by EPNCSU2006 View Post
It's supposed to do that. It will click back on as soon as the computer senses that the engine is turning.

That's what I was kind of steering towards with my question above.
 
  #5  
Old 07-18-2008, 09:21 PM
Hawkeye58
Hawkeye58 is offline
Senior User
Thread Starter
Join Date: Jan 2002
Location: Las Vegas
Posts: 207
Hawkeye58 is starting off with a positive reputation.
Relay

Thanks for responding guys. My pumps will not run. I do hear the relay clicking on then a few seconds later it clicks off.
Your info helps. I know the circuit is good now at least. The pumps need replacing though.

Hawkeye
 
  #6  
Old 07-19-2008, 08:31 AM
baldboyford
baldboyford is offline
Senior User
Join Date: Jan 2006
Location: Brinkhaven, OH
Posts: 255
baldboyford is starting off with a positive reputation.
Are your pumps in tank or out on the frame rail? You could run jumper wire from the pump directly to the battery to test your conclusions before you start to tear it apart. Just a suggestion.
 
  #7  
Old 07-19-2008, 05:30 PM
Hawkeye58
Hawkeye58 is offline
Senior User
Thread Starter
Join Date: Jan 2002
Location: Las Vegas
Posts: 207
Hawkeye58 is starting off with a positive reputation.
pumps

Good idea. I have put 12 volts to the frame rail pump and it's toast. I don't hear anything from the fuel tank either. I used to hear both running during tests some time ago. ( I don't get to work on my truck everyday due to busy schedule).
Now since I am tracing the troubles I got curious about the actions of the fuel pump relay. You fellas helped me out. I got both my pumps yesterday (New), pretty pricey, I hope they last a long time. I will be trying to get both installed this weekend and then I'll see where I'm at. Once again Thanks for your insight.

Hawkeye
 

Thread Tools
Search this Thread

Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.