Fitech force fuel pump

[Dadstruck]

Anyone try using force fuel pump? if so where did you mount it on your squarebody?

 

[Ricko1966]

You'd have better luck getting answers if you posted a pic,a screenshot anything to clue us in. Unless you truly want to hear from people that have used that exact fuel pump and know it by name assuming force is the specific name of that pump and they don't have more than one version.

 

[Dadstruck]

You must be registered for see images attach

 

[Dadstruck]

You must be registered for see images attach

This is the pump that is fed from mechanical pump and then to the throttle body. I'm juat curious on where any that has used one of these has mounted it in engine bay. This is the truck its going in.

 

[Bextreme04]

You must be registered for see images attach

This is the pump that is fed from mechanical pump and then to the throttle body. I'm juat curious on where any that has used one of these has mounted it in engine bay. This is the truck its going in.

I haven't seen anyone use one before, but basically just slam it in wherever convenient. What are you running it on that has both a mechanical fuel pump and needs 58PSI? Just an older original engine but with a sniper or similar TBI fuel injection system? I'd probably want to mount it on the passenger side if so. Hard to tell on dimensions, but it might fit under the battery tray and then you can just run everything right there. Output from the pump system could run back along the inside of the frame rail and then up the back of the transmission bell housing to the TBI to keep everything pretty well hidden if you want.

 

[Dadstruck]

I am installing fitech fuel injection. The mechanical pump feeds the force fuel pump that runs to the throttle body. Basically its a sump pump .

 

[Bextreme04]

I am installing fitech fuel injection. The mechanical pump feeds the force fuel pump that runs to the throttle body. Basically its a sump pump .

Should be pretty simple then. Hopefully you have a factory three port mechanical pump. If so, I'd switch to a 2 port pump and then use the factory return line from the mechanical pump as the return for the force pump. Pretty straight forward from there.

 

[Old Guy Bill]

$500 and you still have to use the mechanical pump....?

 

[bucket]

$500 and you still have to use the mechanical pump....?

Yes.

The benifit of these styles is adding high pressure FI, but not having to revamp the entire fuel system. Some people don't care for it due to the cost and redundancy, but other people are willing to pay for it due to the ease of install.

 

[Old Guy Bill]

I understand it but.... the mechanical pump is the weak point in the system in my opinion

 

[75gmck25]

If you have dual tanks, this type of FiTech pump/ surge tank is the cheapest solution. You just feed the stock mechanical pump output to the surge tank input, and then the high pressure pump feeds the EFI. Cheaper than having to buy two in-tank EFI pumps and installing a 6 port dual tank valve that can handle the EFI fuel pressure.

 

[Old Guy Bill]

Yes, that makes complete sense with in tank pumps but the OPs is a '77 I believe

 

[bucket]

I understand it but.... the mechanical pump is the weak point in the system in my opinion

Mechanical pumps are plenty capable of enough volume, just not enough pressure. All it has to do is feed the surge tank that has the high pressure pump installed in it.

 

[75gmck25]

Please excuse, my long explanation, but I’ve been looking at EFI and gathering info on this topic for a while.

The high pressure pumps used with EFI are relatively expensive, and GM chose to use in-tank units when they switched to EFI. They are designed to be fully supplied with fuel at all times, are immersed in the fuel to cool them, and they maintain EFI system input pressures all the time. They also work much better as a pusher close to the gas tank than a puller like the stock mechanical pump.

Since our trucks often have dual tanks, that means you either need two of everything, or you need to figure out how to switch the fuel feed back and forth without losing any fuel pressure. A single pump up near the engine compartment may not stay fully supplied with fuel all the time, which means your engine won’t perform well and/or the pump may suffer. The older tank switching solenoids are not rated for EFI pressures, so using an external pump at each tank may not work well.

The FiTech unit is relatively expensive, but at about $500 for the fuel pump and surge tank combo its not a bad price, and can be a very simple installation without even crawling under your truck. The only issue I’ve found is that most surge tanks require a fuel return and some are returnless (I guess they just dead-head). If you need a fuel return (this unit does) then the return needs to go all the way back to the fuel tank, and you should switch it with the tanks, which can be a challenge. I’m not sure the stock fuel return line can be used for both the mechanical pump return and the EFI pump return.

 

[Dadstruck]

Yes sir, you are correct. The mechanical pump return will be capped off and the factory return line will be used for the Fitech return line. There should be no reason to have two return lines since the Fitech will be returning all unused or excess fuel itself. The master kit I bought has everything needed hoses, clamps, fittings, pump, efi, 02 sensor and a return line bung for fuel tank if needed. My truck does have dual tanks which both work surprisingly lol. So, hopefully this all falls into place with no big issues.