Fuel Pump Mileage
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
My Excursion has 285k odometer miles, over 320k real miles due to oversized tires. I’m actually replacing my fuel pump today. 
I installed a fuel pressure gauge and saw that although at idle it’s around 60-62psi under any kind of load it drops into the high 50”s.
After replacing the fuel pump is there anything special I need to do to prime it other than cycling the key? I assume it will take more than the 3 cycles after a filter change...
I installed a fuel pressure gauge and saw that although at idle it’s around 60-62psi under any kind of load it drops into the high 50”s.
After replacing the fuel pump is there anything special I need to do to prime it other than cycling the key? I assume it will take more than the 3 cycles after a filter change...
Hotshot
Joined: Dec 2014
Posts: 17,829
Likes: 3,114
From: Jersey Shore
The only thing I would suggest you do is while priming, disconnect the alternator/glow plugs cable off the pass positive terminal. I do that with every filter change so I don’t deplete the batteries more then necessary when just priming. You might be doing a few more cycles, so....
Lead Driver
Joined: Jul 2004
Posts: 6,951
Likes: 512
From: Foothills, CA
My Excursion has 285k odometer miles, over 320k real miles due to oversized tires. I’m actually replacing my fuel pump today.
I installed a fuel pressure gauge and saw that although at idle it’s around 60-62psi under any kind of load it drops into the high 50”s.
After replacing the fuel pump is there anything special I need to do to prime it other than cycling the key? I assume it will take more than the 3 cycles after a filter change...
I installed a fuel pressure gauge and saw that although at idle it’s around 60-62psi under any kind of load it drops into the high 50”s.
After replacing the fuel pump is there anything special I need to do to prime it other than cycling the key? I assume it will take more than the 3 cycles after a filter change...
Hotshot
Joined: Dec 2014
Posts: 17,829
Likes: 3,114
From: Jersey Shore
>>I installed a fuel pressure gauge and saw that although at idle it’s around 60-62psi under any kind of load it drops into the high 50”s.
I don't see this as a problem.
I don't see this as a problem.
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Fleet Mechanic
Joined: May 2010
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From: West by God Virginyuh
Fortunately the brand new pump dropped to 44...even faster than the 300k mile pump did. 🤦♂️😂
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Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
I'm just subscribing, because those are the numbers I have with hugely less miles than, pretty much anyone here, but I'd do another bluespring (for my truck) and look for debris in the primary filter - as I think the next unknown is: does the fuel tank pick-up go out (break apart) based on time, type of fuel (bio, etc.), or vibration, or some combination? All we know is they seem to be falling apart as our trucks age...
As far as a new blue spring...I’m thinking even if a brand new blue spring kit holds 65 at idle, pressure will still drop quickly based on what I’m seeing when I try a heavy foot. 🤷♂️
Hotshot
Joined: Dec 2014
Posts: 17,829
Likes: 3,114
From: Jersey Shore
Nor did I, really, I should have elaborated...what I was a little concerned about was when I did a full throttle run after a bit the pressure dropped to 45 so I let off. I was hoping a new pump would provide enough flow to keep pressure higher during an “accidental” heavy foot episode.
Fortunately the brand new pump dropped to 44...even faster than the 300k mile pump did. 🤦♂️😂
Fortunately the brand new pump dropped to 44...even faster than the 300k mile pump did. 🤦♂️😂
I hope you didn't squeeze the feeding nylon tube to shut down the flow when disconnected, 'cause they don't like that.
But, there might be a flow issue at the tank intake considering how they are breaking apart.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
Yeah, the pickup in the tank worries me.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh