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4th Gen Gas Tank Fuel Pump Hole Access

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Old 12-20-2017, 06:32 PM
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4th Gen Gas Tank Fuel Pump Hole Access

Hi,

I have done some searched and I only can find most of the information is from a 3rd gen gas tank fuel pump hole cut access. I cannot find any information where I can cut a hole to access the 4th gen fuel pump. I thought I saw some information on here before showing the measurements where the hole should be cut at.

I would appreciate if anyone have any information showing where the 4th gen hole measurements showing where it should be cut at.

Thanks.
Old 12-20-2017, 06:46 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

who would have thought Thirdgen.org would be mainly about 3rd generation info...
Old 12-21-2017, 06:26 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Found a YouTube showing how he cut the hole to have access to the 4th gen tank.

Still searching to find more information on how to mark up the hole where to be cut at.
Old 12-21-2017, 07:57 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Absolutely no need for a access hole with a plastic 4th gen tank. The tank drops in 5-10 min with the two straps. Thats why its worth while to swap one in if you ever need to do fuel pump swaps, whch generally is not gonna be offen lol a walbro will typically outlast the car
Old 12-21-2017, 08:37 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Originally Posted by Orr89RocZ
Absolutely no need for a access hole with a plastic 4th gen tank. The tank drops in 5-10 min with the two straps. Thats why its worth while to swap one in if you ever need to do fuel pump swaps, whch generally is not gonna be offen lol a walbro will typically outlast the car
Thanks, I am aware of that the 4th gen tank is easy to drop out, but going through taking the tank out a number of times in the past. It just too much and dont have the time or space. I am just trying to get some ideas what I should do if I should cut the hole or going through dropping the tank again.
Old 12-21-2017, 08:50 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Well the rear end area is basically same on both gens
Old 12-21-2017, 09:00 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

You didn’t say what year, and it varys, certain years are twds the front while others to the rear. Be more specific. My 2000 is twds the rear, I cut cause it was quick, and put a 255 in.
Old 12-21-2017, 09:34 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Originally Posted by irocwagon
You didn’t say what year, and it varys, certain years are twds the front while others to the rear. Be more specific. My 2000 is twds the rear, I cut cause it was quick, and put a 255 in.
My is a 1988, and the plastic tank is from a 1999. Sorry I should have mention it earlier is a "plastic tank".

Did you do any measurement where to cut the hole?
Old 12-21-2017, 09:49 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

http://www.gonicd.com/intankinstall/...mpinstall.html

http://www.worldisround.com/articles/12533/photo14.html


I can’t guarantee on the cut. I have an 88 and 00 cut but won’t be able to measure till wknd

https://ls1tech.com/forums/fueling-i...imensions.html
Old 12-21-2017, 09:57 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

All the plastic tanks have the pump housing towards the rear of the tank
Old 12-22-2017, 08:03 AM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Originally Posted by scottwrightF1
Found a YouTube showing how he cut the hole to have access to the 4th gen tank.
https://www.youtube.com/watch?v=COOLesyiVNc

Still searching to find more information on how to mark up the hole where to be cut at.
This guy did EXACTLY what you're looking to do and the thumbnail for the video pretty much shows you exactly where to cut. Stop asking and just hack the car up already.
Old 12-22-2017, 10:49 AM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Its a 3 foot by 2 foot hole...right behind the rear seats
Old 12-22-2017, 12:00 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

I'm gonna chime in for no good reason other than open mind.

I'm all about stock setups and originality. But correcting GM's cost cutting measures shouldn't be an issue. GM would rather put the burden on the consumer to pay for tank drop than pay for an engineered access door.

If done right, an access door in a thirdgen is appropriate in my opinion, and particularly because it can be done on the most accurate appearing restoration without compromise to the restoration. The number of pristine cars on this forum where it would not be appropriate is only a very small percentage of the total cars.

Similarly, there are very few pristine cars on this forum where subframe connectors would not be appropriate. But for most of the cars is something that corrects another GM engineering and cost cutting flaw.
Old 12-22-2017, 12:10 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

"If done right, an access door in a thirdgen is appropriate in my opinion"

Agree with you Saxondale

And there's some hacked up stuff out there.


Old 12-22-2017, 12:56 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Lol i dont think alot of guys on here have plastic 4th gen tanks, else they would know how simple and quick you can drop these tanks.

I can somewhat understand an access panel for a stock steel tank but not the 4th gen plastic ones
Old 12-22-2017, 01:33 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

This isn’t my car, but I cut my 00 by this
Attached Thumbnails 4th Gen Gas Tank Fuel Pump Hole Access-87326e67-e16f-4f12-91d2  
Old 12-22-2017, 06:05 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Originally Posted by Bob88GTA
Its a 3 foot by 2 foot hole...right behind the rear seats
Originally Posted by irocwagon
This isn’t my car, but I cut my 00 by this
Thanks, I appreciate the information.
Old 12-22-2017, 09:35 PM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Originally Posted by Saxondale
I'm gonna chime in for no good reason other than open mind.

I'm all about stock setups and originality. But correcting GM's cost cutting measures shouldn't be an issue. GM would rather put the burden on the consumer to pay for tank drop than pay for an engineered access door.

If done right, an access door in a thirdgen is appropriate in my opinion......
I agree with you in principle, but as a mechanic I am also VERY aware that this is not a unique problem to third gen F bodies. In fact MOST cars don't have an access panel. We just dropped the tank on a Nissan X-Terra, and I've done countless others on GM, Ford, and Chrysler cars, trucks, and vans. Only car maker I know of that has ALWAYS included an access panel is Subaru.

I'm not condoning it - but it IS industry standard. If only they used better pumps and sending units....

GD
Old 12-23-2017, 06:00 AM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Originally Posted by Orr89RocZ
...which generally is not gonna be offen lol a walbro will typically outlast the car
This has been my point, most access hole questions I've read here and on Facebook always defend their decision with some form of the "I've replaced too many and don't want to drop the tank anymore" story. Buy a quality part the first time, install it properly, and then you don't have to do it again.
Old 12-27-2017, 07:00 AM
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Re: 4th Gen Gas Tank Fuel Pump Hole Access

Just dropped my 4th gen tank this weekend. Took less than 10 min lol didnt even lower the rear end just put jackstands under the axle. Tank slides out so easily
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