90 D150 fuel pump stops getting power..? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
Thread Tools
#1 Old 06-29-2012, 03:39 PM
mrjph
Registered User
 
Join Date: Jun 2012
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
90 D150 fuel pump stops getting power..?

Hi all, new here, and new to dodge trucks.
Recently acquired a 1990 D150 3.9L in "running condition". Yea it doesn't run. I've seen a few similar threads but this seems a little different.

My main question is: with a multimeter, and when the key is turned, i read 13.xx volts at the fuel pump for literally a fraction of a second, then nothing. I did buy a new pump thinking that was the problem, but now not so sure since the power cuts out right away. Plugged up the new pump and it runs for a 1/2 sec, then nothing. The old pump does nothing, so that probably needed to be replaced either way. Am i correct to assume that the fuel pump should continue to receive power for longer that a fraction of a second? If so, what would be causing the power to be cut off?

It starts right up after pouring fuel into the throttle body, so there is spark.

Per the Haynes manual the typical TBI has a ASD, (which checks out on mine), but no fuel pump relay. What appears to be the part throttle unlock relay(?) seems to be faulty as it clicks on only about 1/2 the time the key is turned.

I have power at all of the relay connectors, the only relay that didn't check out is the part throttle unlock relay, don't even know what that means.



Anybody have any ideas, thoughts, comments, suggestions?? they would be greatly appreciated!!
mrjph is offline  
Sponsored Links
Advertisement
 
#2 Old 06-30-2012, 10:48 AM
mrjph
Registered User
 
Join Date: Jun 2012
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
It was the fuel pump!

Well just went ahead and put it all back together with the new fuel pump and it fired right up!

Talked with a local mechanic here and it turns out that the fuel pump power will be cut off until there is oil pressure.

thanks for all your help!
mrjph is offline  
Closed Thread


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
d150 fuel pump relay Lee0329 Dodge Ram Truck 1st Gen (88 - 93) Forum 6 06-11-2011 12:32 PM
1983 dodge ram d150 fuel pump/fuel problem-PLEASE HELP! breeze4400 Dodge Ram Truck 1st Gen (88 - 93) Forum 0 02-21-2011 10:54 AM
Fuel pump gasket in an 85 D150 318 Travisdean 1972-1987 Dodge Ram Trucks (D, W-series) 5 06-21-2008 11:34 PM
Fuel pump gasket in an 85 D150 318 Travisdean Mopar Muscle Talk 3 06-10-2008 01:55 AM
1988 D150, Fuel Pump...IN or OUT of tank? dodge716 Dodge Ram Truck 1st Gen (88 - 93) Forum 8 08-19-2007 01:39 PM

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

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