How close is too close?

[SwitchbladeII]

I'm in the process of installing a bed tank and it's looks like the tailpipes and the fuel line are going to be close to the tank. Wondering if there is a spec on the safe distance. It's ironic the exhaust from the mufflers back was one of the few things on this truck which didn't need attention. As always any feedback and suggestions are welcome and appreciated.

[gmc684x4]

How close are you inchs or 1/16 of an inch ?

[chev-obsession]

I am going through the same task you are. I’m thinking 3” away from any fuel source that s a minimum. Someone else may say different.

[SwitchbladeII]

Originally Posted by gmc684x4

How close are you inchs or 1/16 of an inch ?

Not sure at this point haven't had a chance to put tank up. There won't be a lot of room if it's less than an inch I will redo the exhaust, maybe that is even to close. I'm going to check with a buddy of mine who does state inspections maybe somewhere in the manual there is a spec on this. Thanks for your reply.

[gmc684x4]

Blazers and suburbans have back tanks in similar placement you can either exist before the wheel like stock or carry it back just give it some room if your not comfortable take it to a exhaust shop to finish

How far are you lowering your truck?

[SwitchbladeII]

Originally Posted by gmc684x4

Blazers and suburbans have back tanks in similar placement you can either exist before the wheel like stock or carry it back just give it some room if your not comfortable take it to a exhaust shop to finish

How far are you lowering your truck?

I like the mufflers under the bed as opposed to under the cab so I may not be able to exit in front of the wheel although I do like the look. I will figure something out once I test fit the tank. It's lowered 2" will be running 235/50-17 tires and that will put it pretty much where I want it. Thanks again for your input.

[Warrens69GMC]

You can also use header wrap for the tailpipes near the tank

[gmc684x4]

If your running a back bumper you will have them dropped down a bit anyway
Look at the lowest bit which proubly be the front cross member aim to keep higher then that

[SwitchbladeII]

Originally Posted by Warrens69GMC

You can also use header wrap for the tailpipes near the tank

Good idea thank you ! My reason for keeping a distance is not only for safety reasons, preheating fuel is never a good idea.

[SwitchbladeII]

Originally Posted by gmc684x4

If your running a back bumper you will have them dropped down a bit anyway
Look at the lowest bit which proubly be the front cross member aim to keep higher then that

I need to keep that in mind, thank you!

[kwmech]

How hot does the actual pipe get at the exit end anyways after it's traveled the length of the vehicle, 120-150 degrees?? Heat shield on the pipe or the tank. Don't need much of an air gap between the 2 with a shield. Header wrap will just hold water and rot the pipe that far back

[SwitchbladeII]

Originally Posted by kwmech

How hot does the actual pipe get at the exit end anyways after it's traveled the length of the vehicle, 120-150 degrees?? Heat shield on the pipe or the tank. Don't need much of an air gap between the 2 with a shield. Header wrap will just hold water and rot the pipe that far back

I need to mount the tank and see what I have for space between tank, fuel line and exhaust. Not sure what the heat is back there but your point is well taken.
Shielding one from the other might be the way to go. Thank you!

[Richard]

Originally Posted by kwmech

How hot does the actual pipe get at the exit end anyways after it's traveled the length of the vehicle, 120-150 degrees?? Heat shield on the pipe or the tank. Don't need much of an air gap between the 2 with a shield. Header wrap will just hold water and rot the pipe that far back

Was going to comment myself almost the same thing. Auto fuel needs 500+ degrees to ignite without a direct ignition source. Newer cars have the exhaust tips very close to plastic bumper covers with no problem.

[SwitchbladeII]

Originally Posted by Richard

Was going to comment myself almost the same thing. Auto fuel needs 500+ degrees to ignite without a direct ignition source. Newer cars have the exhaust tips very close to plastic bumper covers with no problem.

I wasn't concerned about igniting the fuel it was more that the fuel would be heated. Going back to my drag racing days we use to run the fuel through a can with coils and filled with dry ice, it made a difference. Although if the fuel line comes in contact with the tail pipe there could be some issues. I may well be overthinking this. This is what I like about this site there is always various opinions and that is a good thing. Keep them coming!

If anyone out there has a laser surface thermometer and are willing to take readings after the engine is at running temp at front pipe, muffler and tailpipe. I would appriciate it. Thanks again to all reponders.