EFI fuel lines?

[soundcontrol]

Is there an advantage to run a return line all the way, or just use one of those Corvette regulator/filters that has the return built in, mouted near the tank and a single line to the engine?

[shawge]

Better chance at cooling the fuel? 

[soundcontrol]

Better chance at cooling the fuel? 

I read in a Corvette forum that the fuel actually heats up more when going to the engine bay and back, anf that causes it to evaporate quicker. But there gotta be another reason...
If the regulator is after the fuelrails, it could be that the fuel in the rail gets cooler maybe?

[YellowThumper]

I read in a Corvette forum that the fuel actually heats up more when going to the engine bay and back, anf that causes it to evaporate quicker. But there gotta be another reason...
If the regulator is after the fuelrails, it could be that the fuel in the rail gets cooler maybe?

I could picture that happening but assume it would be a slow rise in the tank.  But... if tank temp is rising it is because heat is being drawn from engine area. I would prefer to have a slightly warmed up tank and cooler fuel at time of usage instead of a cool tank and hotter fuel into the engine as it is sitting there waiting to be used.

My 2c
Mike

[soundcontrol]

That make sense, so the best way to get cooler fuel must be with a regulator after the fuelrails then.

[ShelbyDogg]

I run return lines and regulator at the rails just because I think any dirt can be flushed past the injectors. I run external pumps and have heard them howling in hot weather when my tank was low and all of the fuel left in it was hot from the engine transfer. A fill up with cool fuel shuts it up. All of the car manufacturers have gone to return less systems. Search the web for this problem. We have had multiple EFI users reporting hot fuel problems on the power tour, with some having to run the return fuel through a cooler loaded with ice.  I haven't had this problem so I'm sticking with a return system.

[YellowThumper]

There were several threads I have followed on other forums discussing regulators mounted before or after the rails. After was preferred because the regulator is  regulating line pressure with the remaining unused fuel. No chance of it starving the injectors. Injectors will always have all the available fuel the pump will provide. Not just what regulator allows to pass if it was before the rails.

I also like what what you noted Shelbydogg about cleaning out the debris.

Mike

[EbodyMod]

  I am looking at using MSDs atomic system , their installation instructions specifically say not to use hardliners. I found it hard to believe.  Any thoughts

[ShelbyDogg]

My thought is to NEVER put your electronics on top of your engine. When you turn off the big block, where does the heat go? Right to the top. Chrysler tried that with EFI in the 81 imperial air cleaner housing and it failed with the potting material glue melting out. MSD put their ECU right inside a metal throttle body. How crazy is that?

[soundcontrol]

Here's some fuel line routings, not sure which one is the best.


http://www.tanksinc.com/index.cfm?ptype=results&Category_ID=162&home_id=-1&mode=cat

[crash340]

EFI tuners are tending to suggest pump to filter, filter to rails/tbi, rails/tbi to regulator, regulator to tank. keeps the injectors with full flow fuel. besides, thats how Im going to set up my system as recomended by a well known EFI guy

[soundcontrol]

EFI tuners are tending to suggest pump to filter, filter to rails/tbi, rails/tbi to regulator, regulator to tank. keeps the injectors with full flow fuel. besides, thats how Im going to set up my system as recomended by a well known EFI guy

I'll follow your lead. Ready to order a tank/pump now from Tanks Inc. (what do you mean with tbi?)

[shawge]

Throttle Body Injection, the injectors are in the throttle body as opposed to in the manifold.

[crash340]

 
I've just purchased a full system from Rich (FASTMAN EFI ) it's a fast XFI system with the 2.0 TBI, haven't dealt with EFI before and Rich is a big help. The biggest decision was the in tank pump. Was undecided which way to go but ended up choosing the Phantom system, in order to gain the little bit of extra clearance at the top of the tank I intend on making a couple tank strap droppers to just lower the tank without having to modify the straps or body etc, figured I would only need an inch tops, then on top of the tank I'll use some sort of inch spacers to hold it tight against the floor, the back of the tank will be basically left sitting in the same location so I'll taper those top tank to body spacers etc, it's all very new to me so will see how it goes, the motor is not build yet, probably 6 months out

[ShelbyDogg]

I would make a small raised access panel right above the pump hole inside the trunk. It will be hidden by your spare and allows you to change the pump without dropping or draining your tank. Many new cars have this.

Your pump may never go out, but think about everything that has to come off just to drop your tank when you are 800 miles from home and have limited tools.

When you install your TBI, move the new map sensor off of the throttle body. Plug the hole, then run a hose to it. Some have been having problems with reversion clogging maps. Read the FAST and other EFI forums to stay up on things.