69' Fuel system replacement - Chevelle Tech
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post #1 of 7 (permalink) Old Apr 14th, 14, 11:43 AM Thread Starter
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Doug
 
Join Date: Jan 2012
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69' Fuel system replacement

All,

I have a 69' Chevelle with a MJ 468 in it. I'm going with a mechanical fuel pump and already have the 3/8" fuel line run. I am looking to replace the fuel tank and sending unit as well. My questions:

Do I need to go with the 2 vent fuel tank, 2 line sending unit, and non vent cap that is year specific to the 69's?

Since I am building this from the frame up, is there a better option?

Can I run a 70' fuel tank with a vented cap and one line sending unit? I believe those didn't have the fuel tank vents that the 69' had?

I have read through a ton of threads on here and can't seem to find the answer to the questions above.

Thanks for your help.

Doug
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post #2 of 7 (permalink) Old Apr 14th, 14, 1:46 PM
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Ed
 
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Re: 69' Fuel system replacement

Bag the mechanical fuel pump and put a electric pump on that will keep up to your engine and fuel uses. Tap the fuel pump into the oil pressure electric circuit, so that if you lose oil pressure for some reason, the fuel pump will kill the engine. If you go with the return line, put a chiller on the fuel line if you are dragging the car, otherwise, use a fuel tank with a sump in it to always have fuel to pickup and feed the engine (especially if if you are using the car for pro touring).
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post #3 of 7 (permalink) Old Apr 14th, 14, 2:58 PM Thread Starter
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Doug
 
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Re: 69' Fuel system replacement

Ok thanks for the info. I guess I should add that this will be a 99% street car that will be used mostly to cruise in. I obviously want to avoid starving it for fuel but am looking for the best set up to not break the bank and avoid any fuel issues.

Thanks.

Doug
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post #4 of 7 (permalink) Old Apr 14th, 14, 3:24 PM
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Re: 69' Fuel system replacement

I don't have an opinion on which tank would work better, but as long as the tank is vented properly and you have a good quality mechanical pump, it should work fine.

Mike

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post #5 of 7 (permalink) Old Apr 14th, 14, 5:25 PM
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Ed
 
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Re: 69' Fuel system replacement

Quote:
Originally Posted by hdw1679 View Post
Ok thanks for the info. I guess I should add that this will be a 99% street car that will be used mostly to cruise in. I obviously want to avoid starving it for fuel but am looking for the best set up to not break the bank and avoid any fuel issues.

Thanks.

Doug
Doug, in that case I would have left it a 327/350 cu.in. and left the money in my jeans. A 468 is strictly for bragging, not cruising. Something tells me your going to step on this engine eventually and that's why you asked the question.

You may want to look at the vacuum in this 468 because I'm sure you'll want to stop it at some point and your brakes are going to need some.

Good luck.
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post #6 of 7 (permalink) Old Apr 14th, 14, 8:10 PM Thread Starter
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Doug
 
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Re: 69' Fuel system replacement

Haha I Didn't say it wasn't going to get floored every now and then! It's just being built to cruise in. I'm just looking for something that works well and that is relatively simple. Appreciate your help though!

Doug
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post #7 of 7 (permalink) Old Apr 15th, 14, 9:37 AM
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Mark
 
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Re: 69' Fuel system replacement

If I could do it again with what's available today, I'd go with a stock style tank and the aeromotive in-tank electric pump with a return. I'd also make sure all the lines from the tank to the front are stainless or Teflon lined. The fuels today do some funky things to rubber and also can cause vapor lock issues for carbs. If funds allow, I'd go stainless for the tank or at least treat it with something like the Eastwood stuff before putting gas in it.

If you change the lines, I'd also recommend running 8AN to a regulator and 6AN to the carb. This may be a little overkill but could be helpful if you upgrade anything in the future.
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