Stock Fuel System Discussion - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 09-14-2013, 09:51 AM Thread Starter
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Stock Fuel System Discussion

The stock fuel system is pretty basic but I have a question about it. Both of the fuel rails are "dead-headed" as there is an entry of fuel but no return. Because of this, many of our trucks have a different injector, #8, to help it get fuel. The #6 injector supposedly "robs" #8 from getting fuel causing cackle. The even injectors are on the driver's side which the fuel is fed from the front of the rail at injector #2.

If this is true then the passenger side should have the same problem but all of the odd injectors are the same. The fuel is fed from the back, opposite of the evens, in injector #7 to injector #1. Why doesn't injector #1 need to be different if injector #8 does? (being that these injectors are both the farthest from the fuel feed)

Anyone know the answer?

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post #2 of 6 Old 09-14-2013, 11:12 AM
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It has to do with the Firing Order (1-2-7-3-4-5-6-8) Because 6 & 8 are sequential and located right-next to one another...
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post #3 of 6 Old 09-15-2013, 09:18 AM
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If you don't want to spend the money for a RR system you can install a crossover line that will help balance out the fuel pressure load. Some say it makes a world of difference and others none, but common sense tells you it must help, even if just a little. I have had mine in the box it came in for over a year now, I really need to slap that thing on before Winter gets here.

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post #4 of 6 Old 09-16-2013, 11:46 AM Thread Starter
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NC, I replaced my HPOP (among a lot of other things) this past week and the HPOP I bought did not have the check valve springs in the hose fittings. Because of this, the instructions stated to remove any HPOP crossover line as the removal of the check valves accomplished the same thing. If this is true, then why couldn't you remove the check valves going into the fuel rails to also accomplish the same thing?

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post #5 of 6 Old 09-16-2013, 03:35 PM
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Quote:
Originally Posted by 01f25073 View Post
the instructions stated to remove any HPOP crossover line as the removal of the check valves accomplished the same thing.
That just can't be true....

They are two completely different functions.
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post #6 of 6 Old 09-17-2013, 04:33 AM
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Quote:
Originally Posted by 01f25073 View Post
If this is true, then why couldn't you remove the check valves going into the fuel rails to also accomplish the same thing?
I want to say, they 9cv's) have something to do with the split shot injectors...so the pulse doesnt backfeed into the bowl or something to that nature.

For what its worth, i removed mine.(cv's)..didnt notice anything outta the norm.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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