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  #36  
Old 13-10-2011
topstarnec  topstarnec is offline
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i just installed a set of bosch **703 on a 94 xj according to the post.

then i checked a tune up guaid book. something instresting i found on it.

1994-00 4litre xj fuel system pressure 324-352kpa @idle.

that is correct because i checked the fuel rail pressure at school before. that is 350kpa totally within specification.

today i used a convertor to translate the kpa unit to psi.

49psi!

1994-00 4.0 litre xj sold in australia is running at 49psi (idle).
  #37  
Old 13-10-2011
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well that is new info, have to go measure mine now.
So that was with the engine at idle and the vac line disconnected?
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Last edited by rainman; 13-10-2011 at 05:44 PM.
  #38  
Old 13-10-2011
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Quote:
Originally Posted by topstarnec View Post
i just installed a set of bosch **703 on a 94 xj according to the post.

then i checked a tune up guaid book. something instresting i found on it.

1994-00 4litre xj fuel system pressure 324-352kpa @idle.

that is correct because i checked the fuel rail pressure at school before. that is 350kpa totally within specification.

today i used a convertor to translate the kpa unit to psi.

49psi!

1994-00 4.0 litre xj sold in australia is running at 49psi (idle).
I checked mine with a fuel press gauge only 2 weeks ago 1995 with FPR on the rail runs at 39/40psi
  #39  
Old 13-10-2011
topstarnec  topstarnec is offline
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the book called Lubrication and Tune-up Guide

anyway, i want to get an adjustable fuel pressure regulator as i can control the pressure to math any injector fix on it.
  #40  
Old 13-10-2011
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That would be the hesco one?
AGAIN:
So that was with the engine at idle and the vac line disconnected?
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  #41  
Old 14-10-2011
topstarnec  topstarnec is offline
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Today I checked the xj repair manual. It said 94 xj fuel rail pressure should be 31psi with vacuum line connected and 39psi without vacuum line connected. At idle.
  #42  
Old 15-10-2011
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Originally Posted by topstarnec View Post
Today I checked the xj repair manual. It said 94 xj fuel rail pressure should be 31psi with vacuum line connected and 39psi without vacuum line connected. At idle.
That is what my 95 FSM says also....
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