MN80Vette

Summit Racing lists 17 pumps in the 43-60 psi range (like the stock GM pump). If I was using one of those pumps, I wouldn't be so concerned about 5/16 vs. 3/8 return line. However, a friend gave me the GSS340 I am going to use, and that pumps a lot more fuel at a lot more pressure.

I am definitely going to drill out the stock return line and solder in a new 3/8" copper-nickel line bent to match the stock line. I bought a new sender, so I don't have to worry about leftover gasoline when I solder.

7t2vette

Which Ez-EFI system are you going to be using; version 1 or 2?

If you are using version 1, I started a thread about it over 5 yrs ago that you might find some helpful info in. I was a very early adopter of the original Ez-EFI; I have been using it for over 4 yrs now with no issues. I love it!

Here is the thread I started:

https://www.corvetteforum.com/forums...-this-yet.html


Post #260 on page 13 shows my engine bay install:

https://www.corvetteforum.com/forums...is-yet-13.html

Post #274 on page 14 shows my fuel system:

https://www.corvetteforum.com/forums...is-yet-14.html

You can reach the FAST engineers directly, as well as other users, at the FAST product support forum here:

http://www.cpgnation.com/forum/forum...ort-forum.235/

The complete Ez-EFI version1 install manual can be found here:

http://static.speedwaymotors.com/pdf/910-30227.pdf

The complete Ez-EFI version2 install manual can be found here:

http://www.efisupply.com/images/fast...structions.pdf

If you don't want to solder or weld a return fitting in your fuel tank, you can drill a hole and install one of these:



http://www.summitracing.com/int/part...682n/overview/

If you have any questions that you feel I might be able to answer, feel free to contact me.

MN80Vette

Thanks for the wealth of information. I would have responded sooner, but there was a LOT to read in those posts. I read it all.

I am installing the FAST EZ version 1, and it was just delivered today. I signed up on the FAST forum on www.cpgnation.com too.

I studied your engine bay pictures at F.A.S.T. EZ-EFI; is anyone using this yet? - page 4. Very nice. I especially like braided lines from the hard lines on the frame to bulkhead on the front of the block and the hard lines to the fuel rails.

Do you have a parts list for the braided to bulkhead to fuel rail hard lines? I like where you put the regulator and gauge too.

Thanks!!

gator79

only use Teflon lined hose

7t2vette

All the AN parts are -6 in size.

These are the fittings I used at both the frame hard to braided line and block braided to hard line junction points:

http://www.summitracing.com/int/part...637n/overview/




I used those type fittings because I wanted the junction points to be rigidly mounted; I have a 37 degree flare tool which I used to flare all the hard line. I don't think I posted a clear pic of the frame junction point, so here is one before the bracket I fabricated was painted:




The hard lines used these tube nuts and sleeves for 37 degree flared tube ends:

http://www.summitracing.com/int/part...3-2n/overview/

http://www.summitracing.com/int/part...4-2n/overview/




All the braided fittings and hose are Aeroquip.

Hose:

http://www.summitracing.com/int/part...0606/overview/

Straight hose fitting at the frame junction point:

http://www.summitracing.com/int/part...1012/overview/

90 degree hose fitting at the block junction point:

http://www.summitracing.com/int/part...4032/overview/


Although they are stated for use with "low pressure", there are compression type hard to AN line adapters available that don't require the hard line to be flared:

http://www.summitracing.com/int/sear...rder=Ascending

I didn't feel comfortable using the compression type fitting with EFI pressures, which is why I went to the trouble of flaring everything.

BTW, the warnings of gas smell through the regular braided lines is true, and at some point in the near future, I will swapping them all out for the Teflon lined hose and fittings.

Hope this helps.

MN80Vette

That information helps a LOT. Based on input from this thread and from our car club, I decided to go all PTFE hose from the sender to TBI solid lines and back to the sender rather than a mix braided to solid to braided to solid and the reverse back to the sender mostly to reduce the number of fittings. Each braided-solid transition probably restricts flow a little bit and adds a little more risk of a leak.

The ss braided PTFE hose I plan to use () has a 2500 psi max pressure and a 400 degree max temperature, but I was concerned about what type of hose end would work with a Walbro 255 lph high pressure pump:
Socketless barb type like:
Fragola Performance Systems Series 8000 Push-Lite Race Hose Ends

Or socket type like:
Summit Racing® Hose Ends SUM-220690

I plan to use 90 deg bulkhead fittings on the '82 sender and the braided-solid transition on the aluminum bulkhead mounted on the left head:
Bulkhead Adapter Fitting

I think I am ready to order parts. (y)

Thanks everyone for your suggestions and experience. I will start another thread that includes the RPM Air Gap, in-tank pump, plumbing, and FAST EZ.

7t2vette

You can't use regular AN fittings like the links you posted with PTFE hose, it requires specific PTFE fittings:

http://www.summitracing.com/int/sear...ose%20fittings

MN80Vette

I was wondering about that. I was hoping Jegs or Summit would have a tech article on fuel system plumbing, but I didn't find anything. Thanks for the Summit search. I was just about to start my order.

7t2vette

I hoped you hadn't already ordered the wrong ends!

Here ya go: