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Old 02-25-2017, 10:56 PM   #1
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P30 Gas tank removal and rust

Trying to remove the gas tank due to some rust issues. We are having a hard time getting the tank off the bus and need advice on treating the rust. (We've had success with vinegar)

We have disconnected hoses from inside.
Removed electrical plug for fuel pump.
Disconnected filler and vent
Removed 2 of 4 bolts that hold the bands to the truck.


Do you need to remove all 4 bolts of the bands that hold the tank or just two? The back two closest to the rear end seem impossible to remove with all the rust on them.

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Old 02-26-2017, 11:03 AM   #2
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Trying to remove the gas tank due to some rust issues. We are having a hard time getting the tank off the bus and need advice on treating the rust. (We've had success with vinegar)

We have disconnected hoses from inside.
Removed electrical plug for fuel pump.
Disconnected filler and vent
Removed 2 of 4 bolts that hold the bands to the truck.


Do you need to remove all 4 bolts of the bands that hold the tank or just two? The back two closest to the rear end seem impossible to remove with all the rust on them.

i don't know about the gas tank removal, but if its anything like a light truck, there should be straps and usually you need to support the tank while taking the straps off, a piece of plywood on a jack works well and draining the tank as empty as possible makes it easier. just watch out for any wiring for the sender and if equipped electric fuel pump. For the rust you can use OSPHO (name brand) or rust converter. I believe its phosphoric acid that converts the surface of the metal to an oxide that is stable to paint. works similar to vinegar, but better!
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Old 02-26-2017, 01:47 PM   #3
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Phosphoric acid does a great job of converting rust to iron phosphate which makes a good base for paint. Ospho is a good name but anywhere that sells paint should have something similar. Look for "rust converter" on the can and "phosphoric acid" in the ingredients.

I just gave my rusty oil pan a good going over by using a spray bottle to saturate the rusty areas with the converter then primed/painted the next day.

Spray the rusty bolts with penetrating oil for a few days then try loosening. If that doesn't work try heating the nuts (and avoiding heating the tank) and try again. Worst case, cut the bolts and replace them.

If you try heating the bolts make sure the tank is closed up so you don't ignite fumes and create another BIG problem.
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Old 02-26-2017, 03:10 PM   #4
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I have an rv on the P30 frame. The gas tank is as big as a bathtub being a 454 engine. Had it off without much trouble taking all 4 bolts off to drop it without a fight onto boards and then jacked it down.
Suggestions above seem ok. An angle grinder used to cut into the bottom of the bolt and or nut. Cut halfway thru and. then break off with a hammer and chisel. Of course support the tank well before you start.
Hope this helps, bolts and nuts are cheap so go new.
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Old 02-26-2017, 06:45 PM   #5
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I have an rv on the P30 frame. The gas tank is as big as a bathtub being a 454 engine. Had it off without much trouble taking all 4 bolts off to drop it without a fight onto boards and then jacked it down.
Suggestions above seem ok. An angle grinder used to cut into the bottom of the bolt and or nut. Cut halfway thru and. then break off with a hammer and chisel. Of course support the tank well before you start.
Hope this helps, bolts and nuts are cheap so go new.


Sparks flying around a gas tank worries me a little.

We tried filtering the gas with a diy fuel filter I made, but ended up pulling the tank because the fuel pump quit working. It looks like there was a mouse's nest on top of the gas tank where the fuel pump sits. Good thing we removed the tank because the wires to the fuel pump were chewed up.

Can I just order a replacement P30 gas tank? There was a model number on the tank that pulled up on google and it just seemed to be a standard P30 tank.


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Old 02-26-2017, 06:47 PM   #6
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Originally Posted by BlackJohn View Post
I have an rv on the P30 frame. The gas tank is as big as a bathtub being a 454 engine. Had it off without much trouble taking all 4 bolts off to drop it without a fight onto boards and then jacked it down.
Suggestions above seem ok. An angle grinder used to cut into the bottom of the bolt and or nut. Cut halfway thru and. then break off with a hammer and chisel. Of course support the tank well before you start.
Hope this helps, bolts and nuts are cheap so go new.


Does your RV tank look the same as mine?
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Old 02-26-2017, 07:08 PM   #7
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P30 Gas tank removal and rust

Quote:
Originally Posted by Njsurf73 View Post
i don't know about the gas tank removal, but if its anything like a light truck, there should be straps and usually you need to support the tank while taking the straps off, a piece of plywood on a jack works well and draining the tank as empty as possible makes it easier. just watch out for any wiring for the sender and if equipped electric fuel pump. For the rust you can use OSPHO (name brand) or rust converter. I believe its phosphoric acid that converts the surface of the metal to an oxide that is stable to paint. works similar to vinegar, but better!


Can I use this on the filler and pipes leading to the gas tank too? They are all full of rust. I'd prefer to just order all new parts. Is that going to be impossible to find? The part number on the tank is 15643250
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Old 02-26-2017, 07:13 PM   #8
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Can I use this on the filler and pipes leading to the gas tank too? They are all full of rust. I'd prefer to just order all new parts. Is that going to be impossible to find? The part number on the tank is 15643250
I can not say about how available parts are, but if it's not rusted through, you can treat and paint anything and extend its useful life.
I am sure with the amount of p30 around, there are parts. And filler neck and tubes are probably jelly bean parts. Lots of platforms probably share many common parts.

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Old 02-26-2017, 07:17 PM   #9
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Originally Posted by Njsurf73 View Post
I can not say about how available parts are, but if it's not rusted through, you can treat and paint anything and extend its useful life.
I am sure with the amount of p30 around, there are parts. And filler neck and tubes are probably jelly bean parts. Lots of platforms probably share many common parts.

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Agreed, hit up the junkyards, should be plenty of parts.
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Old 02-26-2017, 07:19 PM   #10
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Year: 1992
Chassis: Cadet
Engine: 5.7 350 gas
Rated Cap: 35 Passenger or 14,500
Quote:
Originally Posted by Njsurf73 View Post
I can not say about how available parts are, but if it's not rusted through, you can treat and paint anything and extend its useful life.
I am sure with the amount of p30 around, there are parts. And filler neck and tubes are probably jelly bean parts. Lots of platforms probably share many common parts.

Sent from my XT1254 using Tapatalk


How do you paint the inside of a gas tank? I've never herd of this. Won't gasoline eat away any paint?
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