'70 LS5 fuel pump and line confusion

[Justin S.]

Below is a picture of my fuel pump. I don't have records of what I purchased but the inlet is facing away from the line and the S hose won't reach. Is there a different pump that would have the inlet clocked ~90* CCW?

The other picture is the fuel line I purchased from Paragon. Could someone post a photo of how the line is ran along the frame? The picture in the AIM doesn't have all of the transitions that are on mine.

[Joe L.]

Re: '70 LS5 fuel pump and line confusion

Below is a picture of my fuel pump. I don't have records of what I purchased but the inlet is facing away from the line and the S hose won't reach. Is there a different pump that would have the inlet clocked ~90* CCW?

The other picture is the fuel line I purchased from Paragon. Could someone post a photo of how the line is ran along the frame? The picture in the AIM doesn't have all of the transitions that are on mine.

Justin------


From what I can see of it, I don't think you have the correct fuel pump. It looks like a pre-1970 pump. 1970 LS-5 used a long cannister fuel pump. As I recall, the AC type number was 40770 but I can't say, for sure, because I'm out of town with no access to my references to confirm.

[Justin S.]

Re: '70 LS5 fuel pump and line confusion

Thanks, Joe.

Can anyone help with the fuel line question?

[Patrick H.]

Re: '70 LS5 fuel pump and line confusion

If you Google "1970 Corvette frame" and click on images, you will find plenty of frames, restored and unrestored, to view.

[Justin S.]

Re: '70 LS5 fuel pump and line confusion

Thanks, Patrick. Sometimes it's the obvious solution.
I've been scrambling to finish everything I can in order to get the body back on the frame so I can move.

[Allen N.]

Re: '70 LS5 fuel pump and line confusion

Here are some pictures I took when I was taking my 70 LS5 apart:



981.jpg982.jpg983.jpg

I had to do some bending on the new lines I purchased to get them to where I was satisfied with them.

Good Luck,
Allen

[Justin S.]

Re: '70 LS5 fuel pump and line confusion

Joe,
I think the problem stems from ordering a gas tank without a return port. I used a pump part #6470424 in my catalog. I'll need to obtain a pump with a single outlet that faces the proper direction.

[Justin S.]

Re: '70 LS5 fuel pump and line confusion

Thanks, Allen

[Joe L.]

Re: '70 LS5 fuel pump and line confusion

Joe,
I think the problem stems from ordering a gas tank without a return port. I used a pump part #6470424 in my catalog. I'll need to obtain a pump with a single outlet that faces the proper direction.

Justin------

In that case, it's probably going to have to be a pre-1968 big block pump. However, I have no idea which one would have the inlet configuration you need.

[Justin S.]

Re: '70 LS5 fuel pump and line confusion

Thanks, Joe. I'll look up some options. If nothing matches I'll fab a transition.

Hope you're enjoying the discounted Euro!

[Mark E.]

Re: '70 LS5 fuel pump and line confusion

Thanks, Joe. I'll look up some options. If nothing matches I'll fab a transition.

Hope you're enjoying the discounted Euro!

Jerry-rigging a fuel system risks creating a new set of problems, including vapor lock due to no return system. Consider getting the correct parts.

[Justin S.]

Re: '70 LS5 fuel pump and line confusion

I can't understand how this could be perceived as Jerry rigging if GM installed single port fuel pumps on production vehicles. A vented cap would solve a vapor lock problem

[Mark E.]

Re: '70 LS5 fuel pump and line confusion

Justin,

I respect your decisions about building your car how you want. Let us know how it works out. Yes, Chevy built 1970 Corvettes with and without return fuel lines (I believe all but LT-1 had them). But why do you think Chevy added a fuel return line for 454s? Would they have incurred this expense if a non-vented gas cap would work just as well?

The condition, originality of the car and your intentions for it may influence your approach as well. If it's a nice car, a more original approach may preserve its value enough to justify any added costs of finding the right parts.

And remember, you posted on the NCRS Forum, not Jalopy Journal. So expect feedback from curmudgeons like me.

[Brian M.]

Re: '70 LS5 fuel pump and line confusion

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1970
Hope these help for the line issue. As for the pump here is a pic/LS5 (corvetteforum).