4.3 in 85 Toyota Fuel Pressure Problems
05-16-2015, 02:21 PM
#1
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4.3 in 85 Toyota Fuel Pressure Problems
****Don't know if this is the correct forum. Please move if it is not.****
Also forgive me that I am not a mechanic and learning as I go.
I am in the middle of an 85 build (full frame off) that has a Chevy 4.3 TBI motor in it. I can get the motor to idle fine, however when I am driving it around the block and I give it gas, it will start to die.
I hooked up a fuel pressure gauge to the pressurized line right off the TBI unit and it is only reading 9psi. Should be at 12psi from everything I have read.
Here is the layout:
Stock Toyota Tank ->*NEW* Inline Fuel Filter (AutoZone generic) -> *NEW* Carter Competition Series Electric Fuel Pump -> TBI with a *NEW* JEGS Billet Adjustable TBI Fuel Pressure Regulator -> return to tank. I believe it is 3/4 tube throughout but I will have to measure when I get back home.
On thing that I am weird out about is that when I "adjust" the allen bolt on the Fuel Pressure Regulator nothing changes. It always measures 9PSI. Should I just put the stock one back on?
Can anyone give me some suggestions?
Does anyone have a 4.3 in their Toy (I know you are out there) that can give me there setup?
Also forgive me that I am not a mechanic and learning as I go.
I am in the middle of an 85 build (full frame off) that has a Chevy 4.3 TBI motor in it. I can get the motor to idle fine, however when I am driving it around the block and I give it gas, it will start to die.
I hooked up a fuel pressure gauge to the pressurized line right off the TBI unit and it is only reading 9psi. Should be at 12psi from everything I have read.
Here is the layout:
Stock Toyota Tank ->*NEW* Inline Fuel Filter (AutoZone generic) -> *NEW* Carter Competition Series Electric Fuel Pump -> TBI with a *NEW* JEGS Billet Adjustable TBI Fuel Pressure Regulator -> return to tank. I believe it is 3/4 tube throughout but I will have to measure when I get back home.
On thing that I am weird out about is that when I "adjust" the allen bolt on the Fuel Pressure Regulator nothing changes. It always measures 9PSI. Should I just put the stock one back on?
Can anyone give me some suggestions?
Does anyone have a 4.3 in their Toy (I know you are out there) that can give me there setup?
05-16-2015, 05:57 PM
#2
Well if it idles properly and then when you demand power fuel pressure drops. So what do you have for a fuel pump? Is it serious enough for the job? otherwise its the regulator not letting enough through to feed the engine. I'm not familiar with that pump, I wonder if something was broken when you got it.
05-17-2015, 03:50 PM
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Just read something about plugging the the return line which should make the pressure go up.
Just tried it and it didn't.
I guess I need a new fuel pump?
Anyone run one of these Airtex E2000 Electric Fuel Pump? Would that work?
Just tried it and it didn't.
I guess I need a new fuel pump?
Anyone run one of these Airtex E2000 Electric Fuel Pump? Would that work?
Last edited by subaruwrx88011; 05-17-2015 at 04:20 PM.
05-17-2015, 06:09 PM
#4
My own druthers are for competition grade stuff. I just have less trouble with them. If successful racers at the track use it, its a safe bet it will work just fine for you.
There is a lot of cheap Chinese junk floating around, so I would be looking at aeromotive. yellow bullet. Not cheap; but no worries either.
There is a lot of cheap Chinese junk floating around, so I would be looking at aeromotive. yellow bullet. Not cheap; but no worries either.
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