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Old 07-12-2015, 12:29 PM   #1
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Stock v6 fuel pressure?

Ok my new fuel pressure gauge is installed and working and has settled in at 55-56 psi everywhere. Done some looking around and most mustangs come with 24 lb. injectors running about 35-39 psi. Why is my pressure so high? Our cars are return less style fuel systems so previous owner can't crank up the FPR to increase the fp (nice old trick). My pump determines the fp so is my pump on steroids?
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Old 07-12-2015, 04:40 PM   #2
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60-80 is normal for an in - tank pump. Not sure where you got the 35-39 number from, and im also fairly certain the V6 injectors are closer to like a 32 lb/min, not 24, but i may be pulling that out of my ***.
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Old 07-12-2015, 04:45 PM   #3
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Are injectors pound per minute or hour?
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Old 07-12-2015, 05:20 PM   #4
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lb/hour or CC/minute
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Old 07-12-2015, 05:23 PM   #5
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Okay so question time. I have always been curious as to what injector sizes mean. Does that mean 24s are capable of flowing 24 pounds of fuel per hour or is that wrong?
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Old 07-12-2015, 05:27 PM   #6
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At a given pressure for which they're rated, that is correct. I'm more familiar with CCs, but for example, at the "normal pressure" of 60-80 psi a 1000 cc/min injector will flow around that much. If you jack the pressure up to around 100 psi though, they'll flow just shy of 1300, but obviously wont do this as well as a real 1300 CC/min injector. Its more of a band aid at that point.
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Old 07-12-2015, 08:07 PM   #7
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Quote:
Originally Posted by Voltwings View Post
60-80 is normal for an in - tank pump. Not sure where you got the 35-39 number from, and im also fairly certain the V6 injectors are closer to like a 32 lb/min, not 24, but i may be pulling that out of my ***.
I was checking out some websites trying to find out anything about the v6 injectors and can't find anything except for coyote v8 stuff and a bunch of formulas but one site mentioned most mustangs use 24lb/ hr injectors rated at 39 psi... I assumed (shouldn't do that I know lol) they meant v6 and v8. I might have misunderstood. Ok so my 56 psi reading on gauge is pretty much normal sounds like. I just thought it was abit high. I used to play with a couple old 80's boosted 4 bangers, so used to much lower fuel pressures lol. Cars were mitsu starion and Chrysler conquest.
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Old 07-13-2015, 04:09 PM   #8
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Though they were 55lbs key on engine off start engine should drop to 45..
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Old 07-13-2015, 09:51 PM   #9
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With my key on and not running my gauge shows like 50 psi then when I start it and there after it stays at 55-56 psi. Wot it drops a little bit
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