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Hz wagon fuel return line plumbing

Started by lcgtr1970 , Dec 16 2016 07:31 AM

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#1 lcgtr1970

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Posted 16 December 2016 - 07:31 AM

Hi guys. Ive installed a 34adm weber on my 202 in my hz wagon. I need to run a fuel return line back to the tank.
Which hose or line can i tap into? There are quite a few there. Also can it be all rubber hose running under the car or does it need to be steel lines?
Thanks
Jordan

#2 yel327

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Posted 16 December 2016 - 03:15 PM

You can't tap into any lines as they are all used for fuel or canister plumbing. You'll have to run a separate fuel line, and probably put another inlet to the tank. It may be possible to put it in a T-piece into the breather for the filler neck which is the rearmost of the three connection points on the driver's side of the tank in the front RH corner of the tank, but i'd check first before doing it (not sure who with), and make sure the filler end connection is all good as you don't want to go spraying fuel around up there. What sort of flow and pressure?


#3 lcgtr1970

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Posted 20 December 2016 - 07:25 AM

.

Edited by lcgtr1970, 20 December 2016 - 07:31 AM.

#4 I'm a Red Motor fiend

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Posted 20 December 2016 - 04:05 PM

Yel pretty much answered your question didn't he? As he said you can't tap into anything. If it was me, I would run a steel line back. I always thought you generally run a return line if your running a big carb or carbs and a hi flow electric pump. I can't understand why you need a return line with one small Weber?

#5 _Muzzy_

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Posted 20 December 2016 - 04:46 PM

Yel pretty much answered your question didn't he? As he said you can't tap into anything. If it was me, I would run a steel line back. I always thought you generally run a return line if your running a big carb or carbs and a hi flow electric pump. I can't understand why you need a return line with one small Weber?


The 34 ADM weber doesn't like any,ore than about 1/12 to 2 PSI, so they will flood at low speed and flood when hot on shut down

as to the fuel return line , I'm sure the ADR tank will have several vents collecting to the charcoal canister, , I would use one of these and instal a vent cap on the tank

#6 I'm a Red Motor fiend

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Posted 20 December 2016 - 06:21 PM

Ok, I see. Why wouldn't you just install an in-line regulator then? I regulate my flow to 2psi. Are you allowed to change the factory emissions gear without compromising legality. It's trivial I know, but your not meant to do it are you?

Edited by I'm a Red Motor fiend, 20 December 2016 - 06:23 PM.

#7 _Muzzy_

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Posted 20 December 2016 - 07:56 PM

Ok, I see. Why wouldn't you just install an in-line regulator then? I regulate my flow to 2psi. Are you allowed to change the factory emissions gear without compromising legality. It's trivial I know, but your not meant to do it are you?

a fuel regulator would work and block the return line,
As to factory emission, a weber isn't factory LOL

#8 I'm a Red Motor fiend

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Posted 20 December 2016 - 08:16 PM

Ha ha yeah, that's a fairly obvious oversight that didn't click.

#9 lcgtr1970

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Posted 22 December 2016 - 05:09 PM

Thanks guys. Just put a kit thru the carby to eliminate any needle n seat or vacuum issues.
I will get a regulator i think and give tjat a go. Seems easy enough and should do the trick too. Cheers

#10 _Macca97_

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Posted 29 December 2016 - 11:38 AM

i guess i was lucky, my 34adm had no return line, just hooked it straight up no problems, why no use the line from the fuel tank to the charcoal canister? do it right and no one would even no


#11 _Muzzy_

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Posted 29 December 2016 - 02:54 PM

i guess i was lucky, my 34adm had no return line, just hooked it straight up no problems, why no use the line from the fuel tank to the charcoal canister? do it right and no one would even no


The Ford ADM ran 2 setups,

1 Return line from carb back to tank, may or may not use a solenoid ( temperature switched to allow return) although most were fitted with the solenoid control. ( I think these are 1986 on unleaded ones.
2 Return line fitted into the fuel pump , achieves the same effect, in a simply way, although not temperature switched. ( I think these ones are early XE)

Also the ADM weber was designed for Ford only and there are about 8 variations that I know of, (. 3.3 , 4.1 manual, auto, Leaded an unleaded, EST.
Some of the differences Jetting, fuel return, power valve. Temperature compensation on idle, solenoid control on idle. Heater plate under carb, switches for ECM controlled timing ( EST)
The other forgotten bit on the ADM the choke runs in 8volts.

Bottom line a ADM weber doesn't cope with the fuel pressure from a Holden pump, so either needs a return line or fuel pressure regulator.

I run a return line with 1mm restrictor inline all the way back to the fuel tank, in. LH 3.3 ,

#12 _Muzzy_

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Posted 29 December 2016 - 03:07 PM

Here is a close up shot of the my weber setup,
I use the decel pot to adjust idle speed when my AC cut in, I have deleted the 2 stage temperature set up in the idle, and use 2 fixed size idle jets, I also, not shown use a ballast resistor inline to reduce voltage to the auto choke, this setup in on a 12port blue 3.3, factory Holden Air filter

Attached Files


#13 _Macca97_

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Posted 29 December 2016 - 05:04 PM

The Ford ADM ran 2 setups,

1 Return line from carb back to tank, may or may not use a solenoid ( temperature switched to allow return) although most were fitted with the solenoid control. ( I think these are 1986 on unleaded ones.
2 Return line fitted into the fuel pump , achieves the same effect, in a simply way, although not temperature switched. ( I think these ones are early XE)

Also the ADM weber was designed for Ford only and there are about 8 variations that I know of, (. 3.3 , 4.1 manual, auto, Leaded an unleaded, EST.
Some of the differences Jetting, fuel return, power valve. Temperature compensation on idle, solenoid control on idle. Heater plate under carb, switches for ECM controlled timing ( EST)
The other forgotten bit on the ADM the choke runs in 8volts.

Bottom line a ADM weber doesn't cope with the fuel pressure from a Holden pump, so either needs a return line or fuel pressure regulator.

I run a return line with 1mm restrictor inline all the way back to the fuel tank, in. LH 3.3 ,

 

so i guess when you say they hate fuel pressure, i got lucky? has been going for 12mths so far, carb is off a 3.3 xe, has fuel in, and electric idle thingo hooked up, and thats it, no choke(played up and never fixed it) idles perfect, has great AFR's through out the range, was on a mildish 202 now on a worn stocker


#14 _Muzzy_

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Posted 29 December 2016 - 07:52 PM

so i guess when you say they hate fuel pressure, i got lucky? has been going for 12mths so far, carb is off a 3.3 xe, has fuel in, and electric idle thingo hooked up, and thats it, no choke(played up and never fixed it) idles perfect, has great AFR's through out the range, was on a mildish 202 now on a worn stocker


What fuel pump do you run the glass bowl style runs a little lower pressure than the late style, can be lucky

#15 _Lazarus_

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Posted 04 March 2017 - 08:43 AM

Interesting article -

 

The Fuel Supply Pipe:

There are differing views on this. I chose to run a separate rubber 300 psi line all the way from the pump damper to the fuel rail damper since the RTA indicated they had no problem with doing it that way. Other people may choose to manage their Fuel Supply Line differently.

The Fuel Return Line:

There are differing views on this. I used the existing Fuel Supply Line because it presented to the Engine's metal return pipe from the Fuel Regulator in the ideal location. The Fuel Return Line will need to be tapped into one of the Vapour Separator Lines below the Vapour Separator next to the Fuel Tank. 

 

 

http://holdenpaedia....I_VK_Conversion


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