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Unread 09-13-2013, 05:06 AM   #1
Agility
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Received 746 injectors instead of 703 - issues?

I ordered a set of injectors for my 97 4.0 XJ but the injectors they sent me are Bosch 746 injectors and not a set of 703 injectors as I expected. I'm finding mixed results in my searches. Some people say the flow rate is too low but some people have had pretty good success using the 746.

I also read that in order to take advantage of the 746 I could install a high pressure fuel regulator.

Anyone have a definitive answer?

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Unread 09-13-2013, 08:04 AM   #2
LimeLJ
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I would not recommend them. The Bosch 0-280-155-746 injectors meet the minimum CC/MIN to hit an 80% injector duty cycle for the engine, but do not account for momentary pressure loss in the fuel system. They could be used, but horsepower could potentially suffer.
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Unread 09-13-2013, 08:48 AM   #3
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If one were to replace the fuel pressure regulator would these injectors fare better? Just trying to get my research straight. I think I read that the optimal (read: superior to just swapping 703 injectors) solution would be a higher pressure regulator with these 746 injectors.

Thanks, Lime, I'm going to contact the vendor and get them replaced.
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Unread 09-13-2013, 03:39 PM   #4
LimeLJ
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Quote:
Originally Posted by XJmaine97 View Post
If one were to replace the fuel pressure regulator would these injectors fare better? Just trying to get my research straight. I think I read that the optimal (read: superior to just swapping 703 injectors) solution would be a higher pressure regulator with these 746 injectors.

Thanks, Lime, I'm going to contact the vendor and get them replaced.
The fuel pressure regulator is part of the fuel pump and can not be replaced. To achieve a high pressure it would require getting a different fuel pump and external regulator.
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Unread 09-13-2013, 04:09 PM   #5
demonoid369
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False, it is quite common for the fuel pressure regulator to be swapped to a adjustable fuel pressure regulator.
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Unread 09-15-2013, 07:00 PM   #6
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So, is it true that the 746 injectors with an upgraded fuel pressure regulator will run as well or better than 703's in an otherwise stock 4.0? I hate to leave a question unanswered for future searches.

My 746's are in the mail and 703's are coming, I'm just wondering if what I read online is true.
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Unread 09-15-2013, 09:01 PM   #7
LimeLJ
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Quote:
Originally Posted by demonoid369 View Post
False, it is quite common for the fuel pressure regulator to be swapped to a adjustable fuel pressure regulator.
Sorry about, seems the regulator on my Dakota pump is locked somehow. The one on my XJ pump is not.

Quote:
Originally Posted by XJmaine97 View Post
So, is it true that the 746 injectors with an upgraded fuel pressure regulator will run as well or better than 703's in an otherwise stock 4.0? I hate to leave a question unanswered for future searches.

My 746's are in the mail and 703's are coming, I'm just wondering if what I read online is true.
Well, yeah, if the fuel pressure is raised the injectors would push more CC/MIN. It might take a bit of experimenting though to get it just right.
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