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Old 02-02-2020, 10:00 AM #16
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I found it fairly easy to do. Watched Tims video so I knew what I was up against. Main thing is I didn't run my tank down enough and thought I could syphon the remaining gas out. There's a baffle plate in the way and couldn't get a hose in all the way. So tank was a bit heavy. I just used a standard jack with plywood and then put it on a dolly to move it around. Remember to get the gasket like Tim said, also the filter screen.
I replaced my original 350K+ pump last Summer with an oem. I was popping EFI fuses, thought it might have been the pump, ended up being an unrelated harness short. But I figured it was good preventive maintenance anyway being 20 years old with high mileage.
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Advice Wanted:fuel pump replacement-gas-tank-99-jpg 
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Old 02-02-2020, 10:25 AM #17
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Originally Posted by dogtail View Post
I found it fairly easy to do. Watched Tims video so I knew what I was up against. Main thing is I didn't run my tank down enough and thought I could syphon the remaining gas out. There's a baffle plate in the way and couldn't get a hose in all the way. So tank was a bit heavy. I just used a standard jack with plywood and then put it on a dolly to move it around. Remember to get the gasket like Tim said, also the filter screen.
I replaced my original 350K+ pump last Summer with an oem. I was popping EFI fuses, thought it might have been the pump, ended up being an unrelated harness short. But I figured it was good preventive maintenance anyway being 20 years old with high mileage.
Hey Keith, glad our video helped you out. In regards to your EFI short, would it blow fuses all the time or just intermittently. I have a friend with the same problem but his seems heat related. His fuse popped on a Death Valley trip and it has also popped back home for him but only on hot days. I have heard that the fuel pump is the component on that EFI circuit that draws the most current from the system and could cause the fuse to blow. When the weather is cooler, his rig seems to be fine. It's my theory that the fuel pump is overheating causing a higher than normal current draw and popping the fuse.

I think I possibly asked you this before but could you share a picture showing exactly where you found your short?
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Old 02-02-2020, 10:36 AM #18
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I replaced my fuel pump after 303k miles. I was getting really delayed cranking times. I replaced it with this fuel pump:

Amazon.com: MUCO New 1pc High Performance Electric Gas Intank EFI Fuel Pump With Strainer/Filter + Rubber Gasket/Hose + Stainless Steel Clamps + Universal Connector Wiring Harness & Necessary Installation Kit: Automotive

Once the fuel pump assembly was pulled out I had to cut and splice the wires together. It fixed my delayed start and ran much better than before. I also suggest replacing your fuel filter while you're at it.
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Old 02-02-2020, 11:13 AM #19
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Originally Posted by mtbtim View Post
Hey Keith, glad our video helped you out. In regards to your EFI short, would it blow fuses all the time or just intermittently. I have a friend with the same problem but his seems heat related. His fuse popped on a Death Valley trip and it has also popped back home for him but only on hot days. I have heard that the fuel pump is the component on that EFI circuit that draws the most current from the system and could cause the fuse to blow. When the weather is cooler, his rig seems to be fine. It's my theory that the fuel pump is overheating causing a higher than normal current draw and popping the fuse.

I think I possibly asked you this before but could you share a picture showing exactly where you found your short?
Initially I had a less than 1 yr old front cat break into 3 pieces and fell out onto the highway. The plug got a little messed up so I just threw in an an old cat temporarily til I could get a new rig side of plug soldered on, along with a new cat covered by warranty. I just let the plug hang free, it didn't look like it would cause a problem. I went a too long without repairing the plug (7 day work weeks, long hours grind). Was just getting a code for not plugging in the front cat, was running ok. But then it started popping EFI fuses. I ended up finding the front cat plastic plug end fell off later and it had a bare end lead end that was tapping metal and shorting out. So I repaired the harness and has been good ever since. It was my fault anyway, just prolonged a repair I should have taken care of right away.
So maybe an area to look at, that harness and maybe possible the front 02 sensor can maybe short out internally.
Here is a pic of my exploded cat, next to the temp one I put back in. Also a pic of the EFI circuit diagram, not good image. But these are available online in large PDF.
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Advice Wanted:fuel pump replacement-broken-front-cat-jpg  Advice Wanted:fuel pump replacement-efi-diagram-jpg 
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Last edited by dogtail; 02-02-2020 at 11:27 AM.
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Old 02-02-2020, 11:22 AM #20
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Initially I had a less than 1 yr old front cat break into 3 pieces and fell out onto the highway. The plug got a little messed up so I just threw in an an old cat temporarily til I good get a new rig side of plug soldered on. I just let the plug hang free, it didn't look like it would cause a problem. I went a too long without repairing the plug (7 day work weeks, long hours grind). Was just getting a code for not plugging in the front cat, was running ok. But then it started popping EFI fuses. I ended up finding the front cat plastic plug end fell off later and it had a bare end that lead end that was tapping metal and shorting out. So I repaired the harness and has been good ever since. It was my fault anyway, just prolonged a repair I should have taken care of right away.
So maybe an area to look at, that harness and maybe possible the front 02 sensor can maybe short out internally.
Here is a pic of my exploded cat, next to the temp one I put back in. Also a pic of the EFI circuit diagram, not good image. But these are available online in large PDF.
Ok, thanks. My buddy Aaron doesn't have any obvious wiring issues so the search for the culprit continues.
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Old 02-02-2020, 11:42 AM #21
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Ok, thanks. My buddy Aaron doesn't have any obvious wiring issues so the search for the culprit continues.
Harness short is high probability. Hot and cold expands and contracts metal. And if he did have a spare front 02 sensor try swapping it out for a test, cause that circuit will pop the EFI fuse. Also could be a wire in the front 02 harness with friction wear thru. Inspect those wires good. Also can try as a process of elimination disconnect the front 02 sensor, will code but run ok. So at least eliminating that part of the circuit.
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Old 02-02-2020, 12:09 PM #22
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Originally Posted by dogtail View Post
Harness short is high probability. Hot and cold expands and contracts metal. And if he did have a spare front 02 sensor try swapping it out for a test, cause that circuit will pop the EFI fuse. Also could be a wire in the front 02 harness with friction wear thru. Inspect those wires good. Also can try as a process of elimination disconnect the front 02 sensor, will code but run ok. So at least eliminating that part of the circuit.
When we were on a Death Valley trip and this problem arose, we tried to eliminate possibilities and I'm pretty sure the O2 sensors were disconnected and the fuse kept on popping. We did the same with the MAF sensor. But, what wasn't disconnected was the fuel pump. I suggested to Aaron the next time it happens that he put a new fuse in and see if the fuse pops immediately when he turns the ignition key on. If it does, I told him to pull the plug to the fuel pump and then try again. If it no longer blows the fuse, that would point to the fuel pump as the culprit. But, I will suggest to him that he carefully inspect all the wiring that runs on that EFI circuit for any obvious problems.
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Old 02-02-2020, 12:33 PM #23
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I’ve ordered the Denso pump with strainer and gasket.
My rig takes a few cranks to start if it’s sat a few hours. I’ve also noticed that it idles rougher when the tank is below 1/4 tank.
My fuel gauge is also really slow to read.
Not sure when I’ll get to it, but I plan to replace the pump and strainer, clean the sender contacts, and refresh all the associated grounds.

I suspect my pump is tired and producing less pressure than it should.
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Old 02-02-2020, 02:54 PM #24
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I’ve ordered the Denso pump with strainer and gasket.

My rig takes a few cranks to start if it’s sat a few hours. I’ve also noticed that it idles rougher when the tank is below 1/4 tank.

My fuel gauge is also really slow to read.

Not sure when I’ll get to it, but I plan to replace the pump and strainer, clean the sender contacts, and refresh all the associated grounds.



I suspect my pump is tired and producing less pressure than it should.
How many miles on the Rig Dieselchessy?

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Old 02-02-2020, 10:35 PM #25
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How many miles on the Rig Dieselchessy?

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214k on it.
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