no_name

I recently got this crazy idea of fuel injecting my 12a. I will be using an old GM throttle boddy FI system from an early Cavilire or Buick Skyhawk ( the ones that use no O2 sensor). However, these units require a fuel pump that gives off 14-18PSI.

I am wondering, what PSI range the GSL-SE fuel pump works at? I am also pondering if the GSL-SE pump is externaly mounted like a GSL? I would think it is because both cars have teh same gas tank, but I don't know that's why I am asking lol.

Thanks,



Ted. (It is basicly the Holley FI kit for our cars I am making)

coldy13

-SE pump is externally mounted, not sure about the pressure but I think it's at least 30psi. I use the -SE pump on my carb'd 12a turbo running it at 4-20psi(4 at idle, 20 under full boost).

Blake

The GSL-SE pump is high pressure (~38-42 PSI). It is external, mounted in the same place as the 12As. The GSL-SE has a different fuel tank, with baffling and a larger fuel pickup.

Frankly, I think you are wasting your time. If you want to do fuel injection on a 12A, just go Megasquirt...or SDS.

no_name

Yes but that costs a few grand, while my system cost a few hundred.

Basicly, I am looking for an exteral pump that works in the range I need (14-18psi)

renns

MS costs a couple hundred...but that's another issue.

Pumps provide flow. If you hook up an efi pump, and run it with an open discharge hose, it won't produce 30 psi. Discharge pressure will be essentially zero, as there is no restriction to flow, which is what causes pressure. In your case, it's the fuel pressure regulator that acts as the restriction, and determines the pressure in the system. Your GM TBI setup likely has an integral regulator built into the TB. So long as the pump you are using is of similar flow rating to that used in the original GM install (so as not to overdrive the reguator), it'll work just fine. I suspect the GSL-SE pump will be a very good match. If you want to do some bench-testing to verify compatibility, bring your parts by my shop some evening next week and I'll give you a hand. I'm less than 30 minutes from Brantford.

no_name

I am just making a list of parts I need to get right now lol. The GM system used a 14-18PSI pump. I figure I could give teh GSL-SE pump a shot, and if it does not work, it cost me like what.... 50$?


Where is your shop located? my car has manny problems, and need a person who knows their stuff ( not like me.... still in the learning process)

trochoid

iTrader: (6)

Keep in mind that the fuel supply line coming off of the tank for the SE pump is the largest supply line of both the 1st and 2nd gen tanks. The carbed pickup line is the same size as the SE return and the SE supply line is bigger than all of the 2nd gen supply lines, including the TIIs.

If you run an SE pump, try and locate an SE pickup set, direct swap on the S3 tanks.

renns

Good point on the tank setup. What year did they switch from feed lines integral with tank to those on a removable mounting plate? Even with swapping the SE pickup assembly there's still the issue of the slosh cup mounted inside the SE tank to prevent starvation at low tank levels.

coldy13

Instead of swapping the pickup, if your tank has a drain plug just take out the plug and put in a 90deg fitting.

trochoid

iTrader: (6)

S3 tanks for sure, don't know about the earlier ones.

no_name

The idea with the 90 degree fitting sounds like it would work well. All the same, this information is gold to me lol.