Fuel Pressure Issues.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 872
Likes: 18
From: Jasper, Mn
Haven't done the drain o-rings yet, but watching where I park, the truck doesn't seem to be leaving "droppings" anymore, and the smell of diesel has faded again, so I think the leak is pretty well back under control, although I can pop the hood and take a look in the morning.
Baatzy
Baatzy
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 872
Likes: 18
From: Jasper, Mn
Finally got some time to work on this. Have done some troubleshooting this morning but I have a couple questions. For those of you with a FP gauge, when you are at KOEO, FP running what pressure does your gauge display? I am running the 61-65 psi spring in my FRx and mine will pump up to about 55-58, then slowly, or extremely slowly bump up to that 65 psi at idle. Also, what voltage should I have across the pump? KOEO I am around that 11.5, KOER GP off it slowly climbed to battery voltage, but it took a good 30 seconds to get it there. Throughout the climb, torque pro was giving Vbatt at 14.3 volts.
I removed the input hose to my frame rail filter and put on a hose into a 5 gallon can and nothing really changed in behavior of the FP gauge, so I don't think I have tank issues. I am going to now bypass the frame filter and go straight into the pump and see what happens while I wait to hear back.
Thanks to anyone up and perusing the forum on a Sunday morning.
Baatzy
I removed the input hose to my frame rail filter and put on a hose into a 5 gallon can and nothing really changed in behavior of the FP gauge, so I don't think I have tank issues. I am going to now bypass the frame filter and go straight into the pump and see what happens while I wait to hear back.
Thanks to anyone up and perusing the forum on a Sunday morning.
Baatzy
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 872
Likes: 18
From: Jasper, Mn
OK, what the hell? I just bypassed the filter and hooked the 5 gallon can and hose assembly straight into the back of the pump, FP gauge went to zero, and stays there. Truck sat and idled for at least 5 minutes though, plus numerous pedal to the floor revs. Fuel pressure stayed at 0! Only side effect is that the truck seems to have more of a growl in the idle.
What on earth?!? 1 month old FP sender take a crap?
Baatzy
What on earth?!? 1 month old FP sender take a crap?
Baatzy
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
Likes: 5,941
From: Lake Hartwell, GA
Finally got some time to work on this. Have done some troubleshooting this morning but I have a couple questions. For those of you with a FP gauge, when you are at KOEO, FP running what pressure does your gauge display? I am running the 61-65 psi spring in my FRx and mine will pump up to about 55-58, then slowly, or extremely slowly bump up to that 65 psi at idle. Also, what voltage should I have across the pump? KOEO I am around that 11.5, KOER GP off it slowly climbed to battery voltage, but it took a good 30 seconds to get it there. Throughout the climb, torque pro was giving Vbatt at 14.3 volts.
I removed the input hose to my frame rail filter and put on a hose into a 5 gallon can and nothing really changed in behavior of the FP gauge, so I don't think I have tank issues. I am going to now bypass the frame filter and go straight into the pump and see what happens while I wait to hear back.
Thanks to anyone up and perusing the forum on a Sunday morning.
Baatzy
I removed the input hose to my frame rail filter and put on a hose into a 5 gallon can and nothing really changed in behavior of the FP gauge, so I don't think I have tank issues. I am going to now bypass the frame filter and go straight into the pump and see what happens while I wait to hear back.
Thanks to anyone up and perusing the forum on a Sunday morning.
Baatzy
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Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Not real sure about how to go about wiring it. It would be nice if you had a something laying around with pins that would fit and you could just disconnect the factory plug temporarily hook it up.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
Likes: 5,941
From: Lake Hartwell, GA
Baatzy, I had some problems with my new ISSPRO FP sending unit after installing. Please see the details here.
Basically, the pressure from the pump destroyed the sending unit due to rapid pressure changes. Once that started to happen my gauge began reading higher and higher and then went to zero. You can see the picture of the "fix action" ISSPRO sent me. They claimed it was a fairly common problem on the earlier model 7.3 Powerstrokes.
This might shed some light on what you are going through.
Basically, the pressure from the pump destroyed the sending unit due to rapid pressure changes. Once that started to happen my gauge began reading higher and higher and then went to zero. You can see the picture of the "fix action" ISSPRO sent me. They claimed it was a fairly common problem on the earlier model 7.3 Powerstrokes.
This might shed some light on what you are going through.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 872
Likes: 18
From: Jasper, Mn
So, in the thought of "my truck is the weirdest damn truck I have ever worked on or heard about" mindset I went out and plumbed the tank to the FP, bypassing the frame filter. My FP gauge works again. Sitting right at that 63-65 psi idle. I'm going to go take it for a drive and see how it acts.
I can already tell you its not going to change though.
Anybody looking for a truck?
Baatzy
I can already tell you its not going to change though.
Anybody looking for a truck?
Baatzy
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 872
Likes: 18
From: Jasper, Mn
As I guessed, plumbing to the tank but around the filter didn't fix anything, acted the exact same.
Said a bunch of words that can't be repeated on a family forum and decided to drop the tank. Found the feed line showed characteristics of a kink, vent lines were disintegrating. Did the necessary fixes, routed the feed line so it shouldn't kink at all and put the tank back in. Somehow got my fuel gauge to read permanently full. FP acts almost the same as before, just takes a little longer to drop, and idles a little higher than normal.
Got a new fuel pump supposed to arrive tomorrow, going to swap that in and see what happens.
Baatzy
Said a bunch of words that can't be repeated on a family forum and decided to drop the tank. Found the feed line showed characteristics of a kink, vent lines were disintegrating. Did the necessary fixes, routed the feed line so it shouldn't kink at all and put the tank back in. Somehow got my fuel gauge to read permanently full. FP acts almost the same as before, just takes a little longer to drop, and idles a little higher than normal.
Got a new fuel pump supposed to arrive tomorrow, going to swap that in and see what happens.
Baatzy
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
Sorry I didn't get a chance to return your call Ethan - we've got the flu bug here, been running around fetching nyquil, helping with homework, chasing the dog.........I sat down for a minute & passed out on the couch and before I knew it, it's 11:30 pm
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 872
Likes: 18
From: Jasper, Mn
Don't worry about it, I spent most of the day under the truck goofing around anyway. However, on a follow up to that, I will be headed home Wednesday of this week, looking to hit SF about 12, give or take. So if you were free and interested in meeting up then, otherwise Thursday is currently free for me as well if that would work. Let me know in whichever way works.
I'll post back after flipping out fuel pumps tomorrow, also, on another note, the fuel level gauge decided to start working again.
Does my truck know I look at 6.0s?
Baatzy
I'll post back after flipping out fuel pumps tomorrow, also, on another note, the fuel level gauge decided to start working again.
Does my truck know I look at 6.0s?
Baatzy
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
You'll get her figured out man - only a matter of time. Give me a shout on your way back......
I should be around Wednesday.
you probably just got that fuel level float stuck a bit, then driving her around she dropped back into place.
I should be around Wednesday.
you probably just got that fuel level float stuck a bit, then driving her around she dropped back into place.