02-02-2020, 10:00 AM
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#16
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Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
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Member
Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
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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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*1999 3.4L, 4wd/5spd, swapped motor and trans, heavy use DD, seasonal rust proofing using WD-40 only
*2000 3.4L, 4wd/5spd, parts rig, picking the carcass
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02-02-2020, 10:25 AM
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#17
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Elite Member
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Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,264
Real Name: Tim
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Elite Member
Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,264
Real Name: Tim
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Quote:
Originally Posted by dogtail
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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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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02-02-2020, 11:13 AM
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#19
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Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
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Member
Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
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Quote:
Originally Posted by mtbtim
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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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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*1999 3.4L, 4wd/5spd, swapped motor and trans, heavy use DD, seasonal rust proofing using WD-40 only
*2000 3.4L, 4wd/5spd, parts rig, picking the carcass
Last edited by dogtail; 02-02-2020 at 11:27 AM.
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02-02-2020, 11:22 AM
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#20
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Elite Member
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Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,264
Real Name: Tim
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Elite Member
Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,264
Real Name: Tim
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Quote:
Originally Posted by dogtail
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.
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Ok, thanks. My buddy Aaron doesn't have any obvious wiring issues so the search for the culprit continues.
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02-02-2020, 11:42 AM
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#21
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Member
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Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
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Member
Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
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Quote:
Originally Posted by mtbtim
Ok, thanks. My buddy Aaron doesn't have any obvious wiring issues so the search for the culprit continues.
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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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*1999 3.4L, 4wd/5spd, swapped motor and trans, heavy use DD, seasonal rust proofing using WD-40 only
*2000 3.4L, 4wd/5spd, parts rig, picking the carcass
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02-02-2020, 12:09 PM
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#22
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Elite Member
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Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,264
Real Name: Tim
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Elite Member
Join Date: Feb 2015
Location: San Jose, California
Age: 58
Posts: 5,264
Real Name: Tim
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Quote:
Originally Posted by dogtail
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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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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02-02-2020, 12:33 PM
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#23
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Join Date: Dec 2019
Location: SW Washington
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Location: SW Washington
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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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Owned 82, 83, 87 pickup, 98, 99 SR5 4runner
Currently own a 98 SR5, 5spd, 4x4, e-locker, no sunroof. 2012 LTD with the normal options.
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02-02-2020, 02:54 PM
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#24
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Elite Member
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Join Date: May 2017
Location: Western PA
Posts: 6,012
Real Name: Jon
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Join Date: May 2017
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Quote:
Originally Posted by Dieselchessy
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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How many miles on the Rig Dieselchessy?
Sent from my SM-J337V using Tapatalk
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread: https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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02-02-2020, 10:35 PM
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#25
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Member
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Join Date: Dec 2019
Location: SW Washington
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Join Date: Dec 2019
Location: SW Washington
Posts: 595
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Quote:
Originally Posted by brillo_76
How many miles on the Rig Dieselchessy?
Sent from my SM-J337V using Tapatalk
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214k on it.
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Owned 82, 83, 87 pickup, 98, 99 SR5 4runner
Currently own a 98 SR5, 5spd, 4x4, e-locker, no sunroof. 2012 LTD with the normal options.
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