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vacuum hoses


 
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thierry45
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Joined: 16 Feb 2020
Posts: 4
Location: Beaugency,France

PostPosted: Sun Mar 01, 2020 11:30    Post subject: vacuum hoses Reply with quote

hello, I am looking for the diagram concerning the vacuum pipes (small pipes 6x4), 3.1td engine, thanking you
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PostPosted: Sun Mar 01, 2020 11:30    Post subject: Google Ads keep this community free to join!


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Joined: 19 Aug 2015
Posts: 31
Location: Worcestershire

PostPosted: Tue May 05, 2020 19:22    Post subject: Reply with quote

I have a 3.1 engine but it's in a 3.0 body. The important pipe is from the vacuum pump, on the back of the alternator, to the brake servo. The small one goes to the sensor array but I don't think it does much since the conversion. The others I have connected are from the intercooler inlet to the H.P. fuel pump and the sensors/switches to the small bore pipe which goes across the back of the engine bay and connects to the air feed to the turbo and front axle. I don't think these do much either.

Hopefully someone with more knowledge will put you right.
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Rhanagar
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Joined: 12 Jan 2010
Posts: 4861
Location: Preston, Lancs.

PostPosted: Mon May 11, 2020 17:56    Post subject: Reply with quote

Depends on year and fuel pump.

1992-1994 you only need the boost compensation line from the inlet to the top of the fuel pump.

1995-1997 you need to do the above. Plus you need to run a line from the back of the alternator to the front axle for the 4wd actuator mounted there. There is also a line that branches out from there to the vacuum reservoir mounted on the LHS chassis.

If you have the electronic pump (usually on 1995-1997 Bighorn auto's, but I have seen them on other models) then you won't need the boost compensation line.
_________________
1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS

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Adkelly
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Joined: 20 Feb 2021
Posts: 1

PostPosted: Sun Feb 21, 2021 21:46    Post subject: Reply with quote

Rhanagar wrote:
Depends on year and fuel pump.

1992-1994 you only need the boost compensation line from the inlet to the top of the fuel pump.

1995-1997 you need to do the above. Plus you need to run a line from the back of the alternator to the front axle for the 4wd actuator mounted there. There is also a line that branches out from there to the vacuum reservoir mounted on the LHS chassis.

If you have the electronic pump (usually on 1995-1997 Bighorn auto's, but I have seen them on other models) then you won't need the boost compensation line.



sorry to drag up a old post but just put a 2.8 into a 3lt. can anyone tell me what port on front axle i need to join into from the back of alternator to get wheel drive working again please
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