LB7s running SAC injectors?????? Chime in please - Page 2 - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Performance Parts Discussion Discussion of Performance Parts For the 01-04 LB7 Duramax Trucks No Advertising

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post #11 of 20 (permalink) Old 08-25-2019, 08:13 PM
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Actually most fuel stations have filters built into their pumps or some where else in the plumbing. Those filters are intended to ensure that the fuel they sell meets certain minimum standards. That doesn't mean that the filters are good enough for our purposes though. I worked at a station when I was a youth that had a problem with one of the gas pumps losing prime and dropping to something like 1 gal/min. They tried a lot of things to make it work right including bypassing the filter in the pump for a while.

Eventually they found that there was a leak in the pipe from the tank to the pump so they moved the actual pump from the island to near the tank. That made it pump a lot faster but of course it turned an air leak into a fuel leak. It was putting fuel into the ground for a long time before they dug up the lines and fixed it. You can thank tricks like this for the EPA regulations about double walled plumbing and tanks that can be inspected for leaks. Many of those old stations were not worth refitting with good tanks and pipes so they closed.

It is correct that fuel from most stations comes from the same source. Most diesel, heating fuel, avgas, gasoline, etc comes through a common pipe line from the refinery to the tank farm in the city where you live. There is some separation between different products. They tend to use heating fuel and diesel as separators between different batches but there is always some cross contamination at the start of any batch. It is unrealistic to think that there are 20 different types of gasoline coming through the pipeline.

A things happen to the fuel at the tank farm before it goes into the truck but the basic fuel is from the same refinery.
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post #12 of 20 (permalink) Old 08-26-2019, 01:23 PM Thread Starter
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Was more referring to local refineries more than stations - although stations are important too - especially when it comes to water. There is a refinery here in Baton Rouge that ALL the local gas and diesel comes from. It's an Exxon refinery that dates back to before WWII. No matter what brand fuel or what station you buy from around here, it came out of that refinery. Probably 90+% of the roughly 30,000 gallons of diesel I've pumped into this truck came from there. My brother, on the other hand, lived in Phoenix and Houston for most of the first ~130k miles (first set of injectors) on his truck. Obviously different oil refineries making the fuel he was buying.

This is about the only real differences I can call out between his truck and mine yet he seems to get ~130k / set of injectors where I get 80k / set. There is also the fact that I towed a good bit more with my truck than he did with his but not sure how much that comes into play either.

Regardless, there is a large range of mileage that people see on LB7s for injector life. A lot of the ones I've seen claim 200k+ miles on factory injectors were completely stock trucks still running factory filter setups with OEM filters.

What causes the huge disparity? I'm not sure but as far as I can tell, it's not Air Dogs and such. I've never seen anyone who could prove that they got 10 additional miles on a set of injectors after installing an Air Dog or what-ever filter system.

What I do know is that the SAC type injectors should pretty much solve the problem.
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post #13 of 20 (permalink) Old 11-22-2019, 03:55 PM
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I've been researching injectors until I'm cross-eyed and have heard nothing but good things about the SAC injectors. I just picked up my '03 from a buddy and it's got 215k on the original injectors and only had an Air Dog for the last 7k miles or so and it's just starting to haze some.

I'm definitely going SAC style, just trying to decide whether to stick with SAC00s or do the SAC45s. Leaning toward the 00s since tuning really isn't in the budget right now. Good to hear some people liking them.

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post #14 of 20 (permalink) Old 11-22-2019, 04:14 PM Thread Starter
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Originally Posted by HuckLB7 View Post
I've been researching injectors until I'm cross-eyed and have heard nothing but good things about the SAC injectors. I just picked up my '03 from a buddy and it's got 215k on the original injectors and only had an Air Dog for the last 7k miles or so and it's just starting to haze some.

I'm definitely going SAC style, just trying to decide whether to stick with SAC00s or do the SAC45s. Leaning toward the 00s since tuning really isn't in the budget right now. Good to hear some people liking them.
I think you're making the right choice with the SACs. Like I said, I KNOW what the VOCs will do on my truck - right at 80k miles give or take 2 or 3 thousand. Been that way for EVERY set. Sure wish they'd had the SAC ones available 15 years ago! I'd probably still be on my second set.
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post #15 of 20 (permalink) Old 11-23-2019, 08:03 PM
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Originally Posted by long-time-dmax View Post
I think you're making the right choice with the SACs. Like I said, I KNOW what the VOCs will do on my truck - right at 80k miles give or take 2 or 3 thousand. Been that way for EVERY set. Sure wish they'd had the SAC ones available 15 years ago! I'd probably still be on my second set.


Yeah, the more research I do, the worse the VOCs sound. And really, the cost difference isnít huge so itís a no brainer


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post #16 of 20 (permalink) Old 11-24-2019, 09:38 PM
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If you are fixing to sell then the next owner probably won't know anything about injector types so you might as well save a few bucks. If you plan to keep the truck then the SAC injectors are the way to go. They will last long enough to pay the price difference easily and you won't have the labor and down time as often.
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post #17 of 20 (permalink) Old 11-26-2019, 03:42 PM
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So one question for you guys. The SAC injectors clearly are the way to go, but for those running them, if you installed them without tuning, did fuel mileage suffer significantly? I'll definitely be doing them in the spring, just not sure if I'll have funds for tuning at the same time

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post #18 of 20 (permalink) Old 11-26-2019, 06:47 PM Thread Starter
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So one question for you guys. The SAC injectors clearly are the way to go, but for those running them, if you installed them without tuning, did fuel mileage suffer significantly? I'll definitely be doing them in the spring, just not sure if I'll have funds for tuning at the same time
When / if I do another set of injectors before buying a new truck, they will be SAC00s so no tuning required. But, I have done a lot of reading on the subject and seen a few posts by guys who installed SAC45s or 40s or whatever the number is (can't remember off hand) and they all say the truck ran fine w/o tuning but they did lose some mpg. I think the consensus was that they lost about 2 mpg with the over-sized SAC injectors w/o tuning.
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post #19 of 20 (permalink) Old 11-26-2019, 06:48 PM
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Sac 00 shouldn't need tuning, I put 45's in mine so I added tunes.
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04 GMC LB7 2500 SAC 45 injectors DSP5 EFI live, ported air inlet. 4" MBRP droning exhaust.
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post #20 of 20 (permalink) Old 11-26-2019, 07:35 PM
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Originally Posted by long-time-dmax View Post
When / if I do another set of injectors before buying a new truck, they will be SAC00s so no tuning required. But, I have done a lot of reading on the subject and seen a few posts by guys who installed SAC45s or 40s or whatever the number is (can't remember off hand) and they all say the truck ran fine w/o tuning but they did lose some mpg. I think the consensus was that they lost about 2 mpg with the over-sized SAC injectors w/o tuning.


Thatís not too bad at all. Was just hoping it wasnít like 5-10mpgs lol


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2003 CCSB LB7 GMC 2500HD D/A 4x4
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Leveled with Bilsteins
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