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6th Generation (1988-1992) Specific discussion of the AE92

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Old 02-03-2010, 04:21 PM   #1 (permalink)
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question on Carbb to to EFI

My question is why would I have to replaise the tank on my sri for a gts one?? Why can't I just use a walbro in-line pump instead thanks so much in advance
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Old 02-03-2010, 05:16 PM   #2 (permalink)
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Originally Posted by boostedminime View Post
My question is why would I have to replaise the tank on my sri for a gts one?? Why can't I just use a walbro in-line pump instead thanks so much in advance

very good question,,
but I think the gas gauge aka fuel sending unit is in the tank..
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Old 02-03-2010, 06:11 PM   #3 (permalink)
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you don't have to replace the tank to get the fuel pump in it. I have a GT-S fuel pump assembly in my SR5. the only reason you would need to replace the tank is for the interior baffles the EFI tank has. If I go below like 3/8s of a tank, I start to starve for fuel going around corners.
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Old 02-03-2010, 06:45 PM   #4 (permalink)
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Sweet man is it fast I'm gona put a st in my 89 sr5 could you tell me what do I need and would a walbro inline work??
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Old 02-03-2010, 06:49 PM   #5 (permalink)
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Old 02-03-2010, 11:23 PM   #6 (permalink)
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Sweet man is it fast I'm gona put a st in my 89 sr5 could you tell me what do I need and would a walbro inline work??
haha yeah, it's a hell of a lot faster than it was.

I ended up running a new fuel line up for the sending line and using the old sending line as my return line. I'm not sure your stock fuel lines are big enough to support the amount of fuel you'll need.

other than that you just need to put the fuel pump in line somewhere and run power from a relay to it. I think it's probably easier just to use an EFI fuel pump assembly in your stock fuel tank.
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Old 02-04-2010, 12:23 PM   #7 (permalink)
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Originally Posted by eage8 View Post
the only reason you would need to replace the tank is for the interior baffles the EFI tank has. If I go below like 3/8s of a tank, I start to starve for fuel going around corners.
That is the same problem I had when I did a EFI swap into my '89 Tercel.

It was a bit frightening to have the engine sputter and die on sweeping left hand curves with traffic behind me. It would really hurt me at autocross also.

Just make sure you maintain more than 1/4 tank of gas and it should run fine.
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Old 02-04-2010, 01:06 PM   #8 (permalink)
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The efi tank has baffles the carb tank doesnt = problems
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Old 02-04-2010, 05:44 PM   #9 (permalink)
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So just run anew line for the feed line and make sure I don't go below 1/4 tank sounds good...what size steal braded line should I get for the feed line??
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Old 02-06-2010, 12:50 AM   #10 (permalink)
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Make sure your braided hose is ok for EFI pressures, alot of them just have the braids for looks purposes. 8mm or 5/16 is fine.
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Old 02-07-2010, 03:48 PM   #11 (permalink)
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Make sure your braided hose is ok for EFI pressures, alot of them just have the braids for looks purposes. 8mm or 5/16 is fine.
I believe all fuel lines that are being sold now are rated for EFI.

Most Toyota EFI systems run between 30 and 40 psi.
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Old 02-07-2010, 08:02 PM   #12 (permalink)
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Ok found a specre 10ft fuel line for 25 bucks on amazone is rated at 50psi
Also how do would I conect the feed and return line to the tank??
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Old 02-08-2010, 02:00 PM   #13 (permalink)
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Quote:
I believe all fuel lines that are being sold now are rated for EFI.

Most Toyota EFI systems run between 30 and 40 psi.
You'd be amazed...

50psi = 3.5bar barely goes with EFI systems, toyotas run at 3-3.5bar IIRC, atleast thats what most bosch systems run and toyota older EFI systems are almost a direct copy of them. IIRC autodata claims the toyota system to be a bosch jetronic derivative.

I'd skip the shitty 50psi line and go with something better, theres nothing like springing a leak due to inferior hoses, plus they balloon up REAL EASY. My fuel line has an operational pressure of 10bar, which is 145psi and burst pressure 30bar or 435psi of its just rubber hose, but its meant for EFI systems.

Better safe than sorry, you dont wanna end up looking like niki lauda.
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Old 02-08-2010, 02:11 PM   #14 (permalink)
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So were can I get some of this super special. 10 bar efi hose

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Originally Posted by Flashmn View Post
You'd be amazed...

50psi = 3.5bar barely goes with EFI systems, toyotas run at 3-3.5bar IIRC, atleast thats what most bosch systems run and toyota older EFI systems are almost a direct copy of them. IIRC autodata claims the toyota system to be a bosch jetronic derivative.

I'd skip the shitty 50psi line and go with something better, theres nothing like springing a leak due to inferior hoses, plus they balloon up REAL EASY. My fuel line has an operational pressure of 10bar, which is 145psi and burst pressure 30bar or 435psi of its just rubber hose, but its meant for EFI systems.

Better safe than sorry, you dont wanna end up looking like niki lauda.
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Old 02-08-2010, 02:50 PM   #15 (permalink)
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Its not "super special" its just regular EFI system hose, I got mine from a hydraulics and pneumatics parts store, I dont know where you'd get that from in USA though. I've had fuel hose balloon up on me and crack to the point that it could of been disasterous had it blown, so take my two cents worth of advice.
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