#8 injector
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Tuned
Joined: Apr 2006
Posts: 331
Likes: 4
From: grorgetown,in
#8 injector
I just got done putting the external fuel pressure regulator kit on my truck and was wondering if i should change the #8 injector? Any input would be great and also is it worth changing it?
Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
I was going to ask the very same question. On DI's website, it says it's a good idea, but I've never heard of anyone actually doing it.
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
I changed mine out, only because I got a replacment for free (thanks to CSIPSD who had a core set of injectors). It's not necessary to replace the LL injector with a standard AD after a regulated return install. However, it does reduce the knock on that cylinder.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
I suppose it depends on how **** you are about these things. Generally, the consensus is there is no need. Also I have traded in my 7 AD and 1 AE injectors so I can tell you there is no need otherwise, I would say "YES!! and I just happen to have one on hand.". 
Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
I could get a very good used one for under $100, but I think I'll just wait and see how bad it is before I do. If I don't like the knock, then I'll swap it out.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
So Ford put the LL injector in there to help quiet some of the knock. But with the RR system, the LL knocks more than a standard AD?
I could get a very good used one for under $100, but I think I'll just wait and see how bad it is before I do. If I don't like the knock, then I'll swap it out.
I could get a very good used one for under $100, but I think I'll just wait and see how bad it is before I do. If I don't like the knock, then I'll swap it out.
Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Yeah, by opening everything up in the fuel system, there will be quite a bit of air to get burped out! I'd expect that.
BTW- What have you guys found is a good pressure to run? I don't have an in-dash gauge so I'll have to adjust it at idle with the gauge on the regulator. So the better question is "What kind of pressures should I set at idle? I know each truck is different, but just curious.
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Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
Yeah, by opening everything up in the fuel system, there will be quite a bit of air to get burped out! I'd expect that.
BTW- What have you guys found is a good pressure to run? I don't have an in-dash gauge so I'll have to adjust it at idle with the gauge on the regulator. So the better question is "What kind of pressures should I set at idle? I know each truck is different, but just curious.
BTW- What have you guys found is a good pressure to run? I don't have an in-dash gauge so I'll have to adjust it at idle with the gauge on the regulator. So the better question is "What kind of pressures should I set at idle? I know each truck is different, but just curious.
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Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Does it drop once you're driving the truck or at WOT?
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
correct...then if you put in a walbro fuel pump..it will stay at 65 during WOT runs..till then the PSI may drop some..
Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
That's what I figured. I'm still running the stock pump but will eventually go to a larger one down the road. I'm kinda wanting to try the new Fuelab brushless pump. Alot more expensive than the Walbro so who knows.