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Unread 12-11-2011, 06:49 PM   #1
wvpv
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1993 ZJ 
 
Join Date: Nov 2010
Location: Vancouver, BC
Posts: 18
Effects of changing fuel pump to '95 model on 93 zj

I have a 93 zj with a 4.0 that has had the factory fuel pump replaced with a pump from a 95 or 96 zj. The return fuel line has simply been plugged and pressure at the rail reads around 52psi all the time. (I believe the stock system functioned a 31psi at idle, 40psi under load). How would you expect this to affect performance? I get highway mileage of around 17mpg and less than half that in town. I believe that the pump is failing and am wondering if I should restore the stock system when I replace it.
Thanks

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Unread 12-12-2011, 12:43 AM   #2
zander21510
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1995 ZJ 
 
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that definitely doesn't sound right at all. Somebody probably half-assed the job to just get it to run. You probably run pretty rich, which explains your dismal mileage. And no wonder the pump is failing running at that pressure. Definitely replace with a stock system.
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Unread 12-12-2011, 01:20 AM   #3
TheHalfWit
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Quote:
Originally Posted by zander21510
that definitely doesn't sound right at all. Somebody probably half-assed the job to just get it to run. You probably run pretty rich, which explains your dismal mileage. And no wonder the pump is failing running at that pressure. Definitely replace with a stock system.
X2, my 95 gets better mileage and its currently lacking a functional O2 sensor.

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Unread 12-12-2011, 12:16 PM   #4
wvpv
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Thanks guys,
Do you know which pump I should go for? Is the Bosch worth the extra $60-$80 dollars over a Denso, Carter, or Delphi? Thanks
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