2LT Bundera (Direct Inj Diesel) to 1UZFE (EFi Petrol)

[BundyMonkey]

I am in the progress of doing this conversion and have a few queries re the change in fuel type and what extra parts etc I will need.

Thanks

Andrew

[smokem]

What are the queries?

[TWISTY]

What are the queries?

I guess what needs to be done to allow the motor to run with a desiel fuel tank and pump.



You will deffintly need a high pressure EFI pump....I think the std. desiel pump can just feed the EFI pump.......and then hook the lines up to the motor......but you might also need a external swirl pot (i think).....

[eliteforce32]

'external swirl' i belive thay call the a catch can don't they

[South]

no, they call is a swirl pot... catch can is to catch blow-by

[GRINCH]

more commonly known as a surge tank. youll need an electric primer pump + a high preasure efi pump+ youll need to replace all your rubber hoses with efi hose

[I.M.P.O.S.E]

With mine I replaced rubber hoses with EFI hose. I only use a VL pump. Works fine with the V6, not sure how this would go with the v8 though.

[dumbdunce]

I think the std. desiel pump can just feed the EFI pump

there is no diesel pump except the one on the motor.

.......and then hook the lines up to the motor......but you might also need a external swirl pot (i think).....

a surge tank is a very good idea but not 100% essential. best setup is with a low pressure pump feeding fuel form the main tank to a surge tank, and a high pressure pump feeding the motor, with the return line going back into the surge tank.

poor Bundy

[TWISTY]

there is no diesel pump except the one on the motor.

whoops....shows how much I know about diesels.....

best setup is with a low pressure pump feeding fuel form the main tank to a surge tank, and a high pressure pump feeding the motor, with the return line going back into the surge tank.

Just for my own interest.....if the return line from the motor goes back to the surge tank....and you've also got a low pressure pump feeding the surge tank, would you also need to have an overflow from the surge tank back to the main tank?

[dumbdunce]

if the return line from the motor goes back to the surge tank....and you've also got a low pressure pump feeding the surge tank, would you also need to have an overflow from the surge tank back to the main tank?

no. low pressure fuel pumps stop pumping once whatever they are pumping is 'full', so the low pressure pump just tops up the surge tank. this way the efi pump never ever runs dry and the engine never ever runs lean.

[TWISTY]

Cool...thanks for the info.....my zook never ran a surge tank with the Vitari 1.6 EFI swap and I'm looking into setting one up for when its back up and running.....

[ozrunner]

I am in the progress of doing this conversion and have a few queries re the change in fuel type and what extra parts etc I will need.

Andrew, the simple and best answer for you is to get a complete tank from any EFI petrol 4Runner or Surf, 4cyl or V6 it doesn't matter. They have the efi pump already installed in the tank.

Then all you have to do is fit a return hose from your fuel pressure reg to the already installed return hose fitting on the tank etc if the diesels don't have them already .

JD

[BundyMonkey]

I think the std. desiel pump can just feed the EFI pump

there is no diesel pump except the one on the motor.

.......and then hook the lines up to the motor......but you might also need a external swirl pot (i think).....

a surge tank is a very good idea but not 100% essential. best setup is with a low pressure pump feeding fuel form the main tank to a surge tank, and a high pressure pump feeding the motor, with the return line going back into the surge tank.

poor Bundy

So how big would the surge tank need to be?

The Bundy will love it

[Shadow]

I think the std. desiel pump can just feed the EFI pump

there is no diesel pump except the one on the motor.

.......and then hook the lines up to the motor......but you might also need a external swirl pot (i think).....

a surge tank is a very good idea but not 100% essential. best setup is with a low pressure pump feeding fuel form the main tank to a surge tank, and a high pressure pump feeding the motor, with the return line going back into the surge tank.

poor Bundy

So how big would the surge tank need to be?

The Bundy will love it

1l would be heaps. Have a look where youve got space to fit it, this will govern the size of the tank most times.

If for some reason you suffer from fuel starvation on steep inclines/declines you might consider running a bigger surge tank to combat this, but really a 1L tank is heaps.

The surge is really only to feed the motor when you give it a big squirt, the standard low pressure pump will keep up throughout normal driving.

[Shadow]

http://www.velocity-of-sound.com/veloci ... _tanks.htm

[ozrunner]

I just don’t get it. Why complicate matters and basically have the cost of two fuel tanks and two pumps along with more fuel lines when a proper main tank will do. Its not a full on race car.

Using a factory efi main tank with an inbuilt submerged EFI high pressure pump which also come with an inbuilt “swirl pot/ surge tank” is foolproof and probably why Toyota and others use it, .

Each to his own I guess. It's unnecessary crap to contend with and not something I would use on my engine At least be sure you source a high volume low pressure pump or you will risk a major meltdown,

JD

[dumbdunce]

I just don’t get it. Why complicate matters and basically have the cost of two fuel tanks and two pumps along with more fuel lines when a proper main tank will do. Its not a full on race car.

Using a factory efi main tank with an inbuilt submerged EFI high pressure pump which also come with an inbuilt “swirl pot/ surge tank” is foolproof and probably why Toyota and others use it, .

Each to his own I guess. It's unnecessary crap to contend with and not something I would use on my engine At least be sure you source a high volume low pressure pump or you will risk a major meltdown,

JD

sure, but there is no factory efi fuel tank that bolts straight in to a Bundera. It depends on what the builder is going to find more complicated - trying to jam in a tank that doesn't fit, or just fitting a small extra pot that will fit anywhere.

[Nev62]

Guess you could always use a large filter in the engine bay? My Diesel is low pressure from the tank to the filter and low pressure from the filter to the injector pump. Would the same setup not work for an EFI petrol????

[BundyMonkey]

I just don’t get it. Why complicate matters and basically have the cost of two fuel tanks and two pumps along with more fuel lines when a proper main tank will do. Its not a full on race car.

Using a factory efi main tank with an inbuilt submerged EFI high pressure pump which also come with an inbuilt “swirl pot/ surge tank” is foolproof and probably why Toyota and others use it, .

Each to his own I guess. It's unnecessary crap to contend with and not something I would use on my engine At least be sure you source a high volume low pressure pump or you will risk a major meltdown,

JD

sure, but there is no factory efi fuel tank that bolts straight in to a Bundera. It depends on what the builder is going to find more complicated - trying to jam in a tank that doesn't fit, or just fitting a small extra pot that will fit anywhere.

My thoughts exactly and its a smaller tank at that