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Old 03-29-2023, 03:21 PM #1
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Fuel pump replacement interval?

So I’m nearing 380k and 26 years on what I presume is the original fuel pump. Not trying to jinx it but I’ve had no issues with it. I do however have a spare Denso pump that I picked up a year or so ago and I carry it around just in case.

Is there an interval in which I should just replace the fuel pump? I’ve heard of people doing it proactively then the new one they installed shits the bed a few months later.

Is this something better left alone till it fails? I have a 2k mile trip coming up in June and want to get any maintenance that would need doing done before then


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Old 03-29-2023, 04:02 PM #2
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Mine failed around 200k, keep in mind replacing the pump on these involves dropping the tank it’s not like some cars where you can access it through the hole under the rear seat so it would be pretty hard to do a roadside repair
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Old 03-29-2023, 04:14 PM #3
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I changed mine out just after the 400k mark and it was the original. It wasn't doing anything to suggest it was dieing but I didn't want to be stuck somewhere and i was going on a road trip also. It wasnt a difficult job, just run it low on gas so your not wrestling a heavy tank and do the filter at the same time
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Old 03-29-2023, 06:35 PM #4
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Mine failed around 200k, keep in mind replacing the pump on these involves dropping the tank it’s not like some cars where you can access it through the hole under the rear seat so it would be pretty hard to do a roadside repair

Might seem like the lazy and dumb way out but I’d just planned on cutting a hole in the floor and doing it that way. Didn’t want to have to wrestle with potentially snapping bolts.

What symptoms did yours give that indicates the fuel pump failed? Just didn’t start up or were there any symptoms leading up to the failure?


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Old 03-29-2023, 06:37 PM #5
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I changed mine out just after the 400k mark and it was the original. It wasn't doing anything to suggest it was dieing but I didn't want to be stuck somewhere and i was going on a road trip also. It wasnt a difficult job, just run it low on gas so your not wrestling a heavy tank and do the filter at the same time

How difficult was dropping the tank? I had planned on cutting the floor like I said in my other reply. I just don’t want to deal with almost 30 year old bolts snapping and the headache that comes with that


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Old 03-29-2023, 07:14 PM #6
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Mine just suddenly failed, drove fine the night before and wouldn’t start the next morning, I’ve had other pumps fail that showed signs of failure before, mainly low fuel pressure and associated symptoms once warm.

I dropped the tank on my rusty PA rig in 6” of snow, considered cutting the floor but determined there was no way to do it without seriously hacking up the body, dropping the tank isn’t very hard, I’ve done some where the whole rear subframe had to come out first. You’ll want a new strap if you live in a rust prone area as they get pretty thin
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Old 03-29-2023, 07:25 PM #7
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You are actually going to cut the floor out to change the fuel pump? I guess that's one way of doing it?


Do you realize that if your bolts straps etc are really rusty your tank is probably about rotted through?


Start soaking the bolts and put them through heat cycles to get the rust bound broken. If you're lucky you get them put and just replace them along with the strap.

The filler tube if rusty is probably done but really depends on the rust level.


I dropped 3 3td gen tanks already. As I rather know my tank and pump is good then get stranded somewhere. :/ But that's just me.

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Old 03-29-2023, 09:52 PM #8
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You are actually going to cut the floor out to change the fuel pump? I guess that's one way of doing it?


Do you realize that if your bolts straps etc are really rusty your tank is probably about rotted through?


Start soaking the bolts and put them through heat cycles to get the rust bound broken. If you're lucky you get them put and just replace them along with the strap.

The filler tube if rusty is probably done but really depends on the rust level.


I dropped 3 3td gen tanks already. As I rather know my tank and pump is good then get stranded somewhere. :/ But that's just me.

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No my vehicle has no rust on it whatsoever. Frame is totally painted inside and out. I used to have a late 90s ford exploder and it was rusted pretty bad. To change the fuel pump in that you have to drop the tank but after a few bolts snapped I just cut a hole in the floor and swapped the pump in about 20 mins then seam sealed it back up. Like I said it’s the dumb and lazy way but if dropping the tank isn’t bad then I’ll try that way. I had to cut the cam bolts out of my LCA and I just figured these bolts would probably be the same way. Old habits die hard I guess


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Old 03-29-2023, 10:22 PM #9
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I live in the desert and my 4runner is not rusty so dropping the tank didn't take long at all. The hardest part was reaching up and disconnecting the fuel line and not getting a face/armpit full of gas.

Even if its rust free, I'd crawl under there and spray all the bolts with your penetrating fluid of choice a day or 2 before and at least give it a try before cutting into the body.
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Old 03-30-2023, 03:14 AM #10
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I would just change it if you have the time to do it. Mine crapped out on the hwy on my way back after a wheeling trip (380k km). It stuttered a few times and then suddenly the engine just died. I was lucky it didn't happen when I was way out in the back country. I had it towed home so I could do the job in my driveway.

I would suggest dropping the tank. The steel lines connected to the top of the tank would be a pain in the ass to work with without dropping it.
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Old 03-30-2023, 04:08 AM #11
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Fuel pump replacement interval?

Get new gaskets also. Those two seals and the rust under them cause the dreaded EVAP leak code. The one bigger vent line is a bugger on top of the tank.

Watch who you source your pump from quite a few here had new pumps fail within a year of instal.





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Old 03-30-2023, 08:31 AM #12
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Quote:
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No my vehicle has no rust on it whatsoever. Frame is totally painted inside and out. I used to have a late 90s ford exploder and it was rusted pretty bad. To change the fuel pump in that you have to drop the tank but after a few bolts snapped I just cut a hole in the floor and swapped the pump in about 20 mins then seam sealed it back up. Like I said it’s the dumb and lazy way but if dropping the tank isn’t bad then I’ll try that way. I had to cut the cam bolts out of my LCA and I just figured these bolts would probably be the same way. Old habits die hard I guess


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If that's the case, everything will come right apart...

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Old 03-30-2023, 10:19 AM #13
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I would just change it if you have the time to do it. Mine crapped out on the hwy on my way back after a wheeling trip (380k km). It stuttered a few times and then suddenly the engine just died. I was lucky it didn't happen when I was way out in the back country. I had it towed home so I could do the job in my driveway.

I would suggest dropping the tank. The steel lines connected to the top of the tank would be a pain in the ass to work with without dropping it.

Did yours do anything prior to the stuttering that I should look out for or was it just working fine one second then stutter and dead the next?


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Old 03-30-2023, 10:48 AM #14
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Not sure how you would cut the hole bigger with the tank in place (there is a hole already there but it's too small to change to pump). If you can figure out a way you can always drop the tank and while it's dropped you can cut the hole bigger so that you can change the pump more easily in the future.
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Old 03-30-2023, 12:41 PM #15
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Not sure how you would cut the hole bigger with the tank in place (there is a hole already there but it's too small to change to pump). If you can figure out a way you can always drop the tank and while it's dropped you can cut the hole bigger so that you can change the pump more easily in the future.
With no rust issues. Everything would just come right apart. Those line run the length of the tank with other evap hoses. good way to destroy lines and a tank trying to cut a hole big enough to change the fuel pump. Not to mention the angels of the sending unit to remove it out of the tank...:/

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