fuel return pipe on injection pump

[kwondo]

Hi all, can anyone help me i am trying to locate the fuel return pipe" leak off pipe" that takes the unused fuel from the injector pump and returns it to the fuel tank,
as i wish to fit a second solenoid so that i can recirculate unused diesel fuel to a seperate tank in the boot, as my original tank has veg in it, Without this i seem to empty my auxillary tank too quick and it just fills up my original tank.,
cheers
Russell

 

[clivvy]

do you mean, you need to know WHERE it is on your engine? if so, look at your injectors, it joins all 4 of them, and central is the return pipe, tricky to see with the intercooler on.

 

[kwondo]

yes the pipe that fits on the pump is it one of the two close together or is it the one that comes from the front of the pump as shohttp://bebrs.pie-dabas.net/Webs/Terrano/R20/ec.pdfw in the manual ec-301
cheers

 

[clivvy]

its the one called "spill hose", im not 100% sur eif it goes to the front or back, but its one on its own.

 

[geoffdown]

its the one called "spill hose", im not 100% sur eif it goes to the front or back, but its one on its own.

the pipe you want is the 1 from the back of the pump but when running on diesel it wants to be closed loop so t in to the fuel suply line not back to the small tank in boot if that makes sense .:thumbs

 

[kwondo]

Clivvy.....thanks i now know which one i should have used...oops!

hi Geoff, i know what you mean,

Diesel in auxcillay tank in boot ........
......return from injecter pump " closed loop" back to auxcillary supply pipe.... no need to go all the way back to the tank to the tank in boot?

Veg in main tank ...return to same tank using normal return path
or
loop it back to before the heat exchanger so it gets reheated.
which one do you think is better

Thanks
Both

 

[geoffdown]

Clivvy.....thanks i now know which one i should have used...oops!

hi Geoff, i know what you mean,

Diesel in auxcillay tank in boot ........
......return from injecter pump " closed loop" back to auxcillary supply pipe.... no need to go all the way back to the tank to the tank in boot?

Veg in main tank ...return to same tank using normal return path
or
loop it back to before the heat exchanger so it gets reheated.
which one do you think is better

Thanks
Both

hi mate sorry been down pub i return mine to tank and runs ok but no some 1 else with the 2.7 td engine and they have closed loop on both how i think about it if it returns to the main tank it will start to heat that so on really cold days the tank will stay more liquid and be drawn up to the filter better really think it up to u as both ways have their advantages:thumb2

 

[kwondo]

cheers GEOFF,
i have decided to run the seperate tank in the boot with veg and return the unused veg back to the same tank, i decided to use the 2ND solenoid at the main tank return pipe underneath the service hatch in the boot rather than taking it from the injector pump,
Now the return veg keeps the veg fuel nice and warm in the tank,

So in a word....SORTED ! at last

 

[geoffdown]

cheers GEOFF,
i have decided to run the seperate tank in the boot with veg and return the unused veg back to the same tank, i decided to use the 2ND solenoid at the main tank return pipe underneath the service hatch in the boot rather than taking it from the injector pump,
Now the return veg keeps the veg fuel nice and warm in the tank,

So in a word....SORTED ! at last

so how u doing the closed loop for the diesel suply thats y the two valves r up close to the ip

 

[kwondo]

solenoid 1 valve located by the filters close to the heat exchanger
veg or diesel in sent to injector pump,
solenoid 2 valve located on the return fuel line right next to the main tank, underneath the service hatch in the boot either return to main tank or auxcillary tank in boot

operation

solenoid 1-not energised no power, diesel fuel feed as normal to injector pump
solenoid 2-not energised diesel returns to main tank through normal line

extra temp gauge fitted to where the cup holder used to be in the dash, and also switch
when temp reaches 60 degrees i swith on power to solenoids usally after about 2 miles

solenoid 1 energised- switch on power, veg oil runs through heat exchanger and then to injector pump
solenoid 2 return of veg now sent to tank in boot, this return veg is now heated, and will also warm up the rest of the veg in the tank in boot.

the reason that i am using the auxcillary tank in the boot for svo veg is that one day when i can source used veg oil i might try it in this tank first, if everything runs ok i will swap over the fuels in the two tanks.

 

[geoffdown]

solenoid 1 valve located by the filters close to the heat exchanger
veg or diesel in sent to injector pump,
solenoid 2 valve located on the return fuel line right next to the main tank, underneath the service hatch in the boot either return to main tank or auxcillary tank in boot

operation

solenoid 1-not energised no power, diesel fuel feed as normal to injector pump
solenoid 2-not energised diesel returns to main tank through normal line

extra temp gauge fitted to where the cup holder used to be in the dash, and also switch
when temp reaches 60 degrees i swith on power to solenoids usally after about 2 miles

solenoid 1 energised- switch on power, veg oil runs through heat exchanger and then to injector pump
solenoid 2 return of veg now sent to tank in boot, this return veg is now heated, and will also warm up the rest of the veg in the tank in boot.

the reason that i am using the auxcillary tank in the boot for svo veg is that one day when i can source used veg oil i might try it in this tank first, if everything runs ok i will swap over the fuels in the two tanks.

the draw back u got is that if the return valve sticks then the there is a pos of the small tank in the back filling with what should go in to the main tank and could get messey my setup has no return to the small tank so i dont have the problem worse case for me is that diesel in my small tank goes stright to main tank and will empty small tank of diesel very quickly but no mess:thumbs

 

[kwondo]

yes i did realise this, and this was a concern,
my other thought that if i did run a closed loop for the auxcillary tank, say veg for now and run it back thrrogh the heat exchanger rather than back to the tank,

i would of thought i should invest in an inline one way valve either in the tank or inline at the filter....... unless the inline primer pump would stop it going back down the pipe to the tank.
my next thought was if the return fuel is being pumped out of the injector pump would this increase the presuure on the fuel feed pipe going to the pump, as the feed is now beeing sucked and pushed? hope that makes some sort of sense????

 

[geoffdown]

yes i did realise this, and this was a concern,
my other thought that if i did run a closed loop for the auxcillary tank, say veg for now and run it back thrrogh the heat exchanger rather than back to the tank,

i would of thought i should invest in an inline one way valve either in the tank or inline at the filter....... unless the inline primer pump would stop it going back down the pipe to the tank.
my next thought was if the return fuel is being pumped out of the injector pump would this increase the presuure on the fuel feed pipe going to the pump, as the feed is now beeing sucked and pushed? hope that makes some sort of sense????

u have no problems with the closed loop return my small diesel tank is like that and there is a guy who runs a small firm converting to twin tank on alsorts of cars and he close loops both the veg oil (main tank) and diesel (small tank) hope that helps

 

[kwondo]

Just to clarify my original question which is the fuel return pipe, i thought that it was pipe "A" but now not sure, this is a similar pump to mine...zexel
cheers

 

[geoffdown]

Just to clarify my original question which is the fuel return pipe, i thought that it was pipe "A" but now not sure, this is a similar pump to mine...zexel
cheers

yes A is the return pipe to the tank and B is the leak offs from the 4 injectors which go in to pipe A hope that helps:thumbs

 

[kwondo]

cheers again Geoff, now running with the original fuel return on a "y" loop back into supply line. so diesel and veg oil are now on a closed loop, and are not sent back to either tank.