03 expedition wont start--how do you test fuel relay
#46
05-08-2018, 07:20 PM
Failing fuse box
Well the short answer to that is because it will save you money. It WILL fail and they typically fail at 100k-150k depending on climate. It's a known problem and $60. Is peace of mind and cheaper than a tow. But you can waste time testing if you would like. There's hundreds of forums about this with one simple answer, have it repaired.
#47
05-09-2018, 03:57 AM
Kind of funny with a new 3 post user "dtrent" which apparently sent off his fusebox from a 05 Expedition to have it repaired for fuel pump relay, when the 05 Expedition doesn't have this problem and the fuel pump is driven by the fuel pump driver module in the back... 
Sure, it has its own problems, but it's not with any relay for fuel pump..
Sure, it has its own problems, but it's not with any relay for fuel pump..
#48
05-09-2018, 04:32 AM
Laughing Gas
I'm sure each failure is different, so I'll tell about mine. When mine failed, it would stall, then was hard to start. It was never hard to start without stalling first. Limited_865's has never stalled, probably not the relay. Mine stalled twice over a couple weeks time while I researched and did troubleshooting to find the problem. Each time it restarted after about 5 minutes of sitting, no tow needed. I saved money by repairing it myself. It was about $25 to buy a relay and solder sucker to help remove the old relay.
#49
05-09-2018, 05:15 AM
#50
05-09-2018, 05:59 AM
Hotshot
Last night I checked the inertia switch voltage with the key on and it was 3v.
#51
05-09-2018, 09:50 AM
Fuse box failure
Although the 2005 models do have a fuel pump module they still have the same relays in the fuse box which is the same ones that fail in the older models which the fuel pump module needs to operate. In my opinion it's such a common problem that it's just easier to have the fuse box with new parts then troubleshoot other issues after.
#52
05-09-2018, 01:44 PM
Yes, the 05 has a fuel pump relay, but it's not under the same type of load as the older one due to the fuel pump driver module. Failing fuel pump relays are NOT a common failure point for '05 and newer, failing fuel pump driver module however, that is a common failure point due to corrosion.
#53
05-09-2018, 02:19 PM
#54
05-09-2018, 02:25 PM
Laughing Gas
Limited_865, take a look at this thread where I documented my relay issue https://www.ford-trucks.com/forums/1...dom-stall.html I was able to see a bad solder joint where the relay overheated. I redid the joint to get me by while I waited on parts. If the relay is the problem, it should be obvious. At that point you can decide if you have the ability to do it yourself or need to send it for repair. If it's not obvious that it's bad, then it's probably not the problem.
#55
05-17-2018, 10:01 PM
Thread
Thread Starter
Forum
Replies
Last Post
Joel Cassell
1973 - 1979 F-100 & Larger F-Series Trucks
4
11-29-2016 05:41 PM
