91 s10 Blazer fuel tank swap

[GWag89]

I'm ditching the coffin tank if favor of one in the spare tire well. I chose the 20 gallon s10 Blazer tank because of its size and fuel capacity.it seems to be a good comprise between the 2.

The next issue to address is fuel dilevery. I'm fueling a 94 4.0 from a Jeep Xj and I need to get enough psi to support mpfi. I don't think a 91 s10 Blazer fuel pump for tbi 13-17 psi will be enough

[Mustang Shooter]

The pump I normally use is a from a AC Delco replacement kit that builds 90 psi, and is then regulated down to 45 psi.
I believe it is EP381, unfortunately I don't have any of my files available at the moment to verify it.
I used the same 90 psi pump when I swapped a 96 4.0 into my friends Scrambler and several other EFI projects that I have done over the years.
I also have just recently use an Airtex E3270 to test run a 5.0 for a recent build. it also is a 90 psi pump.
I will be using either one when I install my 98 30 gal tank.
Just remove the existing pump and install the higher pressure pump.
Good Luck
Dan

[243]

The 97 Blazer tank fuel pump module is 45-55 gph and 85-105 psi, I was not aware the 91 tank was an option.

[Mustang Shooter]

Ok, the AC Delco pump is a EP376. Both numbers, EP376 and the Airtex E3270, are for a 96 Corvette.
Dan

[GWag89]

Thanks Mustang shooter. I will use the corvette fuel pump with the 91 s10 Blazer sending unit correct?

[ClovisMan]

*Nevermind*

[Mustang Shooter]

Yes, you would use the 91 sending unit assembly with the new pump installed in place of the original.
Remember though, the fuel level sender will not work correctly with your original Jeep fuel gauge.
Many of the EFI swappers are using aftermarket gauge sets that will read the Chevrolet ohm scale, some have been able to take their Jeep sending units and adapt them to the Chevy fuel sending unit or install an additional sending unit into the tank.
I sent my 98 full size Blazer sending unit out this week to a company in New York that will rewind the board so it has the correct ohm scale and polarity. I also sent my Jeep fuel gauge so that it is calibrated right (hopefully).
I probably wont get it back to know how it works until after the first of the year.
Does the 91 tank have any internal baffling or a fuel pan in it?
Dan

[GWag89]

Baffels. Again Thanks for the advise. I'm going to run an aftermarket Guage that is compatible with the gm sending unit

[243]

I am not clear why you chose a 91 tank vs a 97, but the 97 fuel tank module has a reservoir kept full by the pump so pickup does not loose prime until it out of fuel, and no tank baffle or sump is required.

The 91 and 97 tank size and shape is virtually the same.

[GWag89]

I chose a 91 because it's 20 gallon over the 97 19 gal. I like the pick up style you show. Maybe the lock ring will work with my tank

[Mustang Shooter]

Maybe some one can get you a measurement of the 97 tank opening so you can compare it to your 91.
If the tank didnt have the resivour with the sending unit originally, the opening may not be large enough to drop it in.
I was goofing around at lunch and took a resivour from my 94 Camaro to see if it could drop into my 98. It was just wide enough it wouldnt drop through the opening.
It could be cool info if it would work.

[GWag89]

Got the sending unit in with the fuel pump today. part numbers included

[Mustang Shooter]

Good deal! Looks like you're one step closer!

Dan

[GWag89]

Now im designing a fuel tank skid to hold the tank in place. Now that the fuel tank is slap dab in the departure area I need some protection.

I'll have more on the skid in my build thread. I purchased some 2" 3/16 angle iron today to make the frame for the plate. The tank will be strapped to the skid and jacked into place where it will bolt to the rear frame cross member and a square tube X member in front.

Unsure on skid plate thickness. I want beefy but not excessive