How to remote mount a Corvette fuel filter in an FC.

[largeorangefont]

I installed one just like LOF did pretty easily by removing the gas tank front shield (4 bolts), and unbolting the swaybar to chassis bolts (4 bolts). Diff was still in place.

I agree. If you leave the diff in place it is really hard to change the rubber fuel lines that go to the factory hardlines with the tank front heatsheild installed. You will have enough room to work if you remove it.

When you change the filter, you won't have to do this.

[afishyseven]

this is a great write up and i wasnt questioning your location just merely asking how replacement was on the install. can you please repost your pics of the install and maybe a part number for the actual holder for the filter?

[largeorangefont]

this is a great write up and i wasnt questioning your location just merely asking how replacement was on the install. can you please repost your pics of the install and maybe a part number for the actual holder for the filter?

I understand, but just wanted to clarify the maintenence process for others. It is a tight space, but it is easily serviceable. The original post seems to have been lost in transition from one server to another.  I talked to Blake about it and I will just have to recraft the text outlining the procedure. I will have this back up in the next day or so.

The holder comes as part of the filter.

[digitalsolo]

Yeah, sorry guys, the thread damage is my fault.   Not sure why, but the server ate it in the last database move. 

[largeorangefont]

No problem, it happens.

Full guide with pictures is back up.

[mech-head]

Has anyone measured the pressure at the fuel rail with this arrangement?  I would suspect that you would lose a little in the lines over that distance from head loss, especially with the stock 5/16" tubing.  Is this a moot point if you are using the stock fuel lines anyway?  It just makes more sense to me that the pressure regulator be located closer to the injectors.

[largeorangefont]

This fuel filter is mounted in the same area in a Corvette, above the rear diff. This filter will work fine at the rear of the car.

[mech-head]

This fuel filter is mounted in the same area in a Corvette, above the rear diff. This filter will work fine at the rear of the car.

Corvette's also use a 3/8" fuel line to the front.  With the RX7 5/16" line it should make a difference.  A length of line will always have some head loss.  I think it would be worth measuring.  According to an online calculator http://www.lmengines.com/fuel_lines_calc, the line size can make a big difference.  For comparisons, I used the following numbers;

Flow = 1.1 gal/min (around 250 lph)
Hose I.D. = .215" (5/16"), .277" (3/8")
Line Length = 10' (FPR at tank), 3' (FPR at engine bay)
Elevation = 2'

It shows a big difference at a high flow rate, but not so much at lower flow rates.  I was always told it was best to have your pressure regulator close to the engine.  If it is adjustable, you can make up for it.  Of course the Corvette arrangement is not adjustable.

Anyone else have some input on this?

[largeorangefont]

You are right, but many people already run this setup without issue. On an NA car with under 450 WHP this setup will perform fine. Above 500 WHP you should be switching fuel lines anyway. Between 450 and 500 WHP it is debatable.

I will be measuring fuel pressure at the rail when I get my car together anyway so if nothing else, I will have some data in a month or so.

[Pez]

Mech, you're comparing apples to oranges. Flow rate is not the same as fluid pressure. Yes, a 3/8 line will FLOW more than a 5/16, but both can sustain the same psi. Chances are that you're pump will run out of breath before your 5/16 line will run out of capasity.

[mech-head]

You are right, but many people already run this setup without issue. On an NA car with under 450 WHP this setup will perform fine. Above 500 WHP you should be switching fuel lines anyway. Between 450 and 500 WHP it is debatable.

I will be measuring fuel pressure at the rail when I get my car together anyway so if nothing else, I will have some data in a month or so.

LOF, that sounds good.  I am interested to see if there is any affect on pressure at the fuel rail.

Mech, you're comparing apples to oranges. Flow rate is not the same as fluid pressure. Yes, a 3/8 line will FLOW more than a 5/16, but both can sustain the same psi. Chances are that you're pump will run out of breath before your 5/16 line will run out of capasity.

Pez, maybe I am confused on the affect to the fuel system.  Won't the injectors have issues if pressure is not maintained?  If you have 60psi at the outlet of the pressure regulator, and then lose 20 psi due to head loss, will injector efficiency suffer?

I appreciate you guys helping me understand this a little more.

[Pez]

Pez, maybe I am confused on the affect to the fuel system.  Won't the injectors have issues if pressure is not maintained?  If you have 60psi at the outlet of the pressure regulator, and then lose 20 psi due to head loss, will injector efficiency suffer?

I appreciate you guys helping me understand this a little more.

Yes, the injectors will have issues if the pressure is not maintained, but you're assuming that the line size is what would be causing the pressure drop.

Also, you won't loose 20psi just because you're using a 5/16 line.  Unless you're pushing over 485hp (and I know of forum members who have used stock lines to produce up to 485hp with constant pressure at the rail), you're PSI won't drop due to the line size, it will drop due to the fact that the injectors are releasing pressure faster than the pump is applying pressure.

And, we're only dealing with about 7' of line here.  If it were 200', you might have a point.

[mech-head]

Yup, I am probably way off because the line is really not that long.  I am used to dealing with 1/4-1/2 a mile, 6"-10" pipe in irrigation systems.  Eventually the pipe diameter has to decrease to maintain pressure.  I just thought that you would lose some important pressure going through the tubing and all the bends and stuff.  I know that Frijolee is doing fine with stock lines, but I thought his regulator was in the front and that is why it worked okay.  Thanks for chiming in Pez, I appreciate the info.

[hd_positive]

What happed to the rest of the write up?  It was here just the other day?

[digitalsolo]

The forum appears to really, really not like this thread.    That's twice now that the database has eaten part of the post.    I think there is something in the way that the images are laid out or something.    I'm honestly not sure.