'Deleting' multiple fuel filler pipes KZJ78

[graysworld]

One job in the pipeline (excuse the pun) involves removing the fuel tank. I have never seen a set up like it. Multiple pipes going to and fro the tank from the filler neck. I am used to the main filler and a single breather pipe. My question therefore is can I 'delete' the other pipes and have a simple filler and breather combination. Why are there so many pipes?

Graeme

 

[roscoFJ73]

I wouldnt touch it unless I fully understood it. It always works, never fails and has no effects on HP etc. You may even find there is a legal requirement to keep it intact.

 

[jblueridge]

On my diesel thee was a bewildering array of pipes too.
Some were related to injector leak pipes.
I made no attempt to fully understand the set up and simply replaced the tank, hoses and some of the pipes.
Here's the list for all the tank related stuff from Toyota.

022A	HOSE, FUEL(FOR FUEL EVAPORATIVE SEPARATOR)
95332-06010	＊Ｈ，Ｌ＝８０	1​	$2.73
95332-06020	＊Ｈ，Ｌ＝１５０	1​	$7.20
95332-06030	＊Ｈ，Ｌ＝２８０	1​	$11.27
95333-06022	＊Ｈ，Ｌ＝２２０	2​	$21.39
77023​	FILTER SUB-ASSY, FUEL SUCTION TUBE
77023-22040		1​	$16.13
77031​	CAP ASSY, FUEL TANK
77310-35061		1​	$33.88
77031B	GASKET (FOR FUEL TANK CAP)
77316-12050		1​	$5.46
77035​	CABLE SUB-ASSY, FUEL LID LOCK CONTROL
77035-90K02		1​	$43.49
77035A	CLAMP (FOR FUEL LID LOCK CONTROL CABLE)
82711-12200		1​	$2.41
77037​	LOCK SUB-ASSY, FUEL FILLER OPENING LID
77037-90K00		1​	$20.76
77100​	TANK ASSY, FUEL
77100-60280		1​	$672.96
77100A	PLUG(FOR FUEL TANK)
90341-20004		1​	$5.57
77100B	GASKET(FOR FUEL TANK)
90430-20007	T=2.5	1​	$1.34
77100D	HOSE, FUEL, NO.1(FOR FUEL TANK)
90445-22011	長さ＝２２０	1​	$10.40
77131​	BRACKET, FUEL TANK FILLER PIPE SUPPORT
77131-90K00		1​	$8.70
77201​	PIPE SUB-ASSY, FUEL TANK INLET
77201-60200		1​	$179.54
77206​	TUBE SUB-ASSY, FUEL TANK SUCTION
77240-60100		1​	$64.96
77206A	GASKET (FOR FUEL TANK SUCTION TUBE)
77169-14020		1​	$4.78
77213​	HOSE, FUEL TANK SUB INLET
77213-60040		1​	$33.53
77286​	PROTECTOR, FUEL TANK INLET PIPE
77277-90K00	(11/1984 - 07/1987)	1​	$85.83
77277-90K01	(08/1987 - 12/1989)	1​	$29.14
77290​	SHIELD ASSY, FUEL TANK FILLER PIPE
77290-90K00		1​	$36.14
77293A	SHIELD, FUEL TANK FILLER PIPE, NO.3
77293-90K00		1​	$23.05
77308​	COVER SUB-ASSY, FUEL INLET BOX
77305-90K00		1​	$53.02
77308A	CUSHION(FOR FUEL INLET BOX COVER)
90541-05018		2​	$2.21
77322​	KNOB, FUEL TANK CAP
77319-90K00		1​	$9.96
77338A	BRACKET, FUEL TANK CAP LOCK CONTROL ROD
77338-90K01		1​	$11.74
77366​	SPRING, FUEL FILLER OPENING LID HINGE
77366-12010		1​	$2.73
77367​	STOPPER, FUEL FILLER OPENING LID
	Not applicable
77378A	COVER, FUEL FILLER OPENING LID LOCK
77378-90K00		1​	$7.67
77387​	RING, FUEL INLET BOX
77391-32010		1​	$2.25
77606​	PROTECTOR SUB-ASSY, FUEL TANK, NO.1
77606-60030		1​	$326.02
77611​	BAND, FUEL TANK
77601-60080		2​	$84.57
77611A	PIN (FOR FUEL TANK BAND)
90240-10025		2​	$3.52
77631​	BRACKET, FUEL TANK, NO.1
77614-60050		2​	$37.88
77632​	BRACKET, FUEL TANK, NO.2
77625-60020		2​	$44.72
77675B	BRACKET, FUEL TANK FILLER PIPE PROTECTOR, NO.1
77675-90K00		1​	$6.72
77676B	BRACKET, FUEL TANK FILLER PIPE PROTECTOR, NO.2
77676-90K00		1​	$8.70
77701T	VALVE, CHECK (FOR MAIN FUEL TANK)
90917-10020		1​	$55.71

 

[GTSSportCoupe]

One job in the pipeline (excuse the pun) involves removing the fuel tank. I have never seen a set up like it. Multiple pipes going to and fro the tank from the filler neck. I am used to the main filler and a single breather pipe. My question therefore is can I 'delete' the other pipes and have a simple filler and breather combination. Why are there so many pipes?

Graeme

Remember the fuel tank has the important job of serving to cool the injection pump and injectors. The fuel return is critical to this function. Remove that and you'll cook your injection system.

Remove some of those other lines and you might have problems filling at the pump (fuel displaces air; air has to go somewhere). Also, when driving, the tank can build a vacuum as fuel leaves if there is not a proper breather. This can starve the lift pump in the injection pump.

In a nutshell, don't change anything!!!