Pondered that myself but I think a gallon of fuel will stay just as cool as the fuel that would be flowing through a normal manual pump setup or the bowls on a carburetor.
CK5
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Nah, that electric pump in the small tank has to dissipate heat somewhere.
Thinking the factory setup for the pump works just fine
I agree. Also heat soak being that the tank is located in the engine bay.
Mercury marine uses a vapor separator tank like this and we haven't seen any vaporlock issues with them. The only reason the pump would get hot is if it's on it's way out or cavitating because of a plugged return line or something like that. They're also under the cowl and bolted to the side of the block so they definitely experience some heat soak. Ive really considered running one on my crawler but they are $700+ new. Used ones are about the same price as the command center.
And I just learned that the FCC has a deadhead pump and no return back the the FCC. Thought it returned from the throttle body...
Damn this is making me laugh out loud! Mark is posting and getting replies about FiTech when he's not even close to ever using one! 
So back on topic -hehe- there have been problems with the FiTech Fuel Command Center (FCC) heating up the pump. They did a fix with programming in the system. I don't fully understand it so I'll just paste it here:
--------------------------------
I still think it's odd not to run a return off the unit like you would without the FCC. I was thinking the FCC would be the answer for me but I worry about its performance on trail on a hot day and very slow speeds.
I think the FCC would work fine for a typical user's situation, but slow crawling on a difficult trail is not normal.
So when are you getting the FiTech Mark?
So back on topic -hehe- there have been problems with the FiTech Fuel Command Center (FCC) heating up the pump. They did a fix with programming in the system. I don't fully understand it so I'll just paste it here:
--------------------------------
on all the new EFI setups, there will be another parameter to set on the EZ Start menu.
It will be Pulse Width Management percentage setting for the fuel pump. Supposedly all of their EFI setup's PWM default to higher settings, normally only used for an external, or intank, pump without a return line used. The FCC pump is a dead headed 340lph, compared to most common external, or intank pumps being 255lph, or even 340lph with a return. The 340lph dead heading FCC pump overheats, which boils fuel out of the vent, which then blocks the venting process....a snowball effect.
Actually makes perfect sense...
He said my FCC was left powered up for 4 days and with the Fuel Pump IDLE Pulse Width Management set at 38%, the pump temperature was barely higher than a pump that's not running.
--------------------------It will be Pulse Width Management percentage setting for the fuel pump. Supposedly all of their EFI setup's PWM default to higher settings, normally only used for an external, or intank, pump without a return line used. The FCC pump is a dead headed 340lph, compared to most common external, or intank pumps being 255lph, or even 340lph with a return. The 340lph dead heading FCC pump overheats, which boils fuel out of the vent, which then blocks the venting process....a snowball effect.
Actually makes perfect sense...
He said my FCC was left powered up for 4 days and with the Fuel Pump IDLE Pulse Width Management set at 38%, the pump temperature was barely higher than a pump that's not running.
I still think it's odd not to run a return off the unit like you would without the FCC. I was thinking the FCC would be the answer for me but I worry about its performance on trail on a hot day and very slow speeds.
I think the FCC would work fine for a typical user's situation, but slow crawling on a difficult trail is not normal.
So when are you getting the FiTech Mark?
That is correct, with the FCC the return on the TBI unit is just capped.
Actually Edelbrock has a similar setup and I haven't seen any complaints with theirs. It's also more expensive.
Only downside to this is if/when you walk away from the truck. Probably not an issue for what you're using the truck for but more likely on the trail.
I was wondering about getting a switch with a timer so that after some period of time it would shut off.
Or a switch that has to be held down manually.
I'm not convinced a burb tank would fit back there but I haven't measured. It is something I've considered.
I was thinking a fella could put a heat shield around the FCC. Can't be in a hurry for the FCC tho; their backordered until December. Also a good chance that date will get pushed further out too.
You pass me up Eisenhower, we'll talkDamn this is making me laugh out loud! Mark is posting and getting replies about FiTech when he's not even close to ever using one!
So back on topic -hehe- there have been problems with the FiTech Fuel Command Center (FCC) heating up the pump. They did a fix with programming in the system. I don't fully understand it so I'll just paste it here:
--------------------------------
on all the new EFI setups, there will be another parameter to set on the EZ Start menu.--------------------------
It will be Pulse Width Management percentage setting for the fuel pump. Supposedly all of their EFI setup's PWM default to higher settings, normally only used for an external, or intank, pump without a return line used. The FCC pump is a dead headed 340lph, compared to most common external, or intank pumps being 255lph, or even 340lph with a return. The 340lph dead heading FCC pump overheats, which boils fuel out of the vent, which then blocks the venting process....a snowball effect.
Actually makes perfect sense...
He said my FCC was left powered up for 4 days and with the Fuel Pump IDLE Pulse Width Management set at 38%, the pump temperature was barely higher than a pump that's not running.
I still think it's odd not to run a return off the unit like you would without the FCC. I was thinking the FCC would be the answer for me but I worry about its performance on trail on a hot day and very slow speeds.
I think the FCC would work fine for a typical user's situation, but slow crawling on a difficult trail is not normal.
So when are you getting the FiTech Mark?
One other problem with FCC is it can only have maximum of 8psi inlet pressure so I would need a regulator to drop the pressure of the TBI pumps down.
I'm a little lost now...Is there some advantage to the FCC system? Listening to you guys it sounds inferior in several regards.
I honestly don't know how much power can be gained from this system over the stock TBI. It would be great to see the same truck dynoed pull with each system
I'd think FItech would do such testing to validate their products...
Haven't looked for a while but if you order the throttle body with the FCC you can get them sooner. It's been a while since I looked though.
It just replaces the factory ECMI'm a little lost now...Is there some advantage to the FCC system? Listening to you guys it sounds inferior in several regards.
I want to see the FITech with a knock sensor, hate leaving extra timing on the table
No sour grapes. You have a very nice thread here.
The FCC does? I thought that was just the 1-gallon tank, an optional addon for those not running factory-style fuel pumps.
Or maybe I'm more confused than I thought.
