Just installed my 3990105 lift pump today and need a little help.
Q: I was told I needed the pigtail harness for this pump, but my stock harness plugged right into the new pump with no problems. Do I even need the new harness (it has the same ends as my stock one)? If so, how would the new harness connect? 1. leave the old harness on and add the new one? or 2. take off the old harness (covered in tape and loom) and add the new one seperately? Or is the new pigtail supposed to help "convert" an old style harness with the new one? I'm confused.
Q: Do the washers on the fuel lines (banjo bolts) go one on each side? They fell off when I unscrewed them, so I assumed one went on the front and one on the back as you screw them into the pump.
Q: I aslo assumed the "out" side of the pump faces to the front of the truck (going toward the fuel filter), but didn't see the writing until I got the pump off. Is this right? Just want to be sure. The pump won't run if it's backwards will it?
Other than having to be some sort of circus freak to reach the dang thing (don't know how some of you do it so easily), the install went pretty well. Had to let the filter drop to get to it all though. Fired it up and went for a test drive, seemed to be fine. But, when I first turn the key, I don't hear the pump "fire up" and cycle from inside the cab like I did in the past. Had to open the door and listen real close for the noise, but it was there. Forgot to "bump" the starter and let it cycle longer first, but she started right up. Would that be problem?
I don't have a pressure gauge, so I hope I did this thing right. It was showing symptoms of failure in the old pump (and maybe along with some paranoia on my part from reading all the posts), but I wanted to ere on the side of caution and insurance. In cab guage is next on the list.
Q: I was told I needed the pigtail harness for this pump, but my stock harness plugged right into the new pump with no problems. Do I even need the new harness (it has the same ends as my stock one)? If so, how would the new harness connect? 1. leave the old harness on and add the new one? or 2. take off the old harness (covered in tape and loom) and add the new one seperately? Or is the new pigtail supposed to help "convert" an old style harness with the new one? I'm confused.
Q: Do the washers on the fuel lines (banjo bolts) go one on each side? They fell off when I unscrewed them, so I assumed one went on the front and one on the back as you screw them into the pump.
Q: I aslo assumed the "out" side of the pump faces to the front of the truck (going toward the fuel filter), but didn't see the writing until I got the pump off. Is this right? Just want to be sure. The pump won't run if it's backwards will it?
Other than having to be some sort of circus freak to reach the dang thing (don't know how some of you do it so easily), the install went pretty well. Had to let the filter drop to get to it all though. Fired it up and went for a test drive, seemed to be fine. But, when I first turn the key, I don't hear the pump "fire up" and cycle from inside the cab like I did in the past. Had to open the door and listen real close for the noise, but it was there. Forgot to "bump" the starter and let it cycle longer first, but she started right up. Would that be problem?
I don't have a pressure gauge, so I hope I did this thing right. It was showing symptoms of failure in the old pump (and maybe along with some paranoia on my part from reading all the posts), but I wanted to ere on the side of caution and insurance. In cab guage is next on the list.