Garage Storage Organization and Garage Cabinets

phaxtris · **EFI pump in a tbi**

so the story goes, im swapping a turbo into my tbi 90 dodge shadow, and i wanted to do the fuel pump before the rest of it if possible, my question is, will putting an efi pump in my tbi cause major issues, i know the 91's use the efi pump in the tbi cars

short of it

can i put a wallbro 255 in my 1990 dodge shadow TBI for a short while untill i put the turbo motor in ??

fiat22turbo · 07-19-2005, 07:18 PM

That's what the fuel pressure regulator is for

Una · 07-19-2005, 07:30 PM

Shouldn't be an issue.

phaxtris · 07-19-2005, 08:00 PM

alright, i didnt think it would be ither, but i wanted to get some other feedback before i spent 4 hrs dropping the tank and putting the pump in, as soon as it gets here ill put it in, and tell you all how it works out

fiat22turbo · 07-19-2005, 08:13 PM

I didn't think you needed to drop the tank to do the pump swap. I was able to do the pump in my Daytona with the tank in place. The other K-based cars are the same. If it is a problem you can place a turbo regulator upstream of your stock regulator to drop the pressure to 55psi (hint the 84-87 turbo one cars have a perfect regulator for this, also some of the Volvo cars had regulators preset to 45psi)

Good luck,
Stefan Mullikin
Mullikin Racing

22dodge · 07-19-2005, 09:00 PM

Here's what I just found out... for years and years I was always under the impression the pumps were different between multipoint (and turbo) vs TBI... since TBI only runs like 12 psi and multipoint is 32+. infact I pulled a fuel pump from a minivan that was a replacement which had a sticker that stated 3.0, 3.3, turbo... Ok so that goes right a long with what I though... so today my 2.5 1994 voyager wouldn't start... no pump, I jumpered the fuel pump relay and wacked the tank a few times and the pump started... I got the van home, pulled the tank and found the fuel pump had the exact same part number as one I had on the shelf from a 3.3... so just to confirm, I hit napaonline and autozone on line... did a part number comparison... both Napa and Zone list the same part number for 2.5 TBI and the 3.3... Well to answer your question... looks like it will work but do what I did, compare part numbers and see for yourself.

Una · 07-19-2005, 10:28 PM

Quote:

Originally Posted by 22dodge

Here's what I just found out... for years and years I was always under the impression the pumps were different between multipoint (and turbo) vs TBI... since TBI only runs like 12 psi and multipoint is 32+. infact I pulled a fuel pump from a minivan that was a replacement which had a sticker that stated 3.0, 3.3, turbo... Ok so that goes right a long with what I though... so today my 2.5 1994 voyager wouldn't start... no pump, I jumpered the fuel pump relay and wacked the tank a few times and the pump started... I got the van home, pulled the tank and found the fuel pump had the exact same part number as one I had on the shelf from a 3.3... so just to confirm, I hit napaonline and autozone on line... did a part number comparison... both Napa and Zone list the same part number for 2.5 TBI and the 3.3... Well to answer your question... looks like it will work but do what I did, compare part numbers and see for yourself.

A couple other people have posted in other threads in the past that the TBI got the high pressure pump starting around 1991. Makes sense for ma Mopar, the pumps probably cost the exact same by then, and it's less complicated to just put the same pump in everything.
I think this person's only concern is the flow of the Walbro 255.. It's hard for a turbo car to keep the pressure down to normal half the time. And he's going to be trying to run even less pressure than that, so even more flow going back to the tank.. It'll raise his pressure some, it even did on my turbo car (only 2.5psi), the question is will it be too high for the computer to adapt.

turbovanman · 07-20-2005, 11:48 AM

I personally think the TBI reg won't be able to cope with the added volume and its going to run very rich.

I have gone thru my Carter pump book before and indeed, they did start using one pump for all starting 90-91 ish. Earlier models are different, don't know why.

Warning, this info is for Dodges only. GM and other makes use extremely different fuel pumps for there injection setups,

phaxtris · 07-20-2005, 05:17 PM

ahh, well i guesse i will just have to do it all in one weekend

i just changed the fuel pump a few mounths ago, there is no way to do it without removing the tank

22dodge · 07-20-2005, 07:30 PM

I just put a pump into my 94 voyager. took a total of 20 min thats including dropping the tank...you don't have to actually take the tank out of the car, just drop the strapps and hang it at an angle by the filler tube. Put a floor jack under it with a board on top of the jack so you don't dent the tank.

phaxtris · 07-20-2005, 07:44 PM

why do people think that because they are k cars everything is the same, trust me on this, you cannot do it

bluneon · 08-07-2005, 11:21 AM

my shadow is a 94 TBI.

so when i do my turbo conversion, i will NOT have to bother with the fuel pump?
if so, that's great!

Una · 08-07-2005, 11:41 AM

Quote:

Originally Posted by bluneon

my shadow is a 94 TBI.

so when i do my turbo conversion, i will NOT have to bother with the fuel pump?
if so, that's great!

That's correct, but you will want to watch a fuel pressure gauge the first time you get into boost, just to be safe.