For All high output motors

[brobradh77]

My mechanic just informed me of a bulletin about to be made public about running super unleaded in the H.O. motors. Apparantly there is something lacking in either the fuel itself or the motor that prevents high octane fuelfrom burning properly shortening the life of fuel pumps. They said although it was recommended in the owners manual we should only be running regular for now on. For those who think this is BS the Fords are also having similar problems which are not wanting to start up especially when its cold out and idleing rough. I am a true believer of this as I have only 9000 miles on my truck and am having a new fuel pump installed next week.

[rivierakid55]

not gonna cause me to change. my wife filled mine up once unknowingly with 87 and it pinged like crazy. id rather dump a new fuel pump in it every so often than run the risk of serious internal engine damage running lower than 91 octane fuel.

[brobradh77]

not gonna cause me to change. my wife filled mine up once unknowingly with 87 and it pinged like crazy. id rather dump a new fuel pump in it every so often than run the risk of serious internal engine damage running lower than 91 octane fuel.

 

Ok just thought people would like to know this because I priced the fuel pump for my 06 and its $440 not counting labor if your not under warranty. I have been running high octane since december and it only took 5 months to wipe out my fuel pump.

[bagged7104ss]

not gonna cause me to change. my wife filled mine up once unknowingly with 87 and it pinged like crazy. id rather dump a new fuel pump in it every so often than run the risk of serious internal engine damage running lower than 91 octane fuel.

 

I put 87 octane in my ss one time being stupid and didn't notice till it was just about full. The truck pinged and pinged till I added two bottles of lucas octane booster to bring it up. I think you would do much more damage driving around with the pinging motor. I never had a problem with my fuel pump and it was in there for almost 60k.

[brobradh77]

maybe I just had bad luck but I ran 87 for 9 months and my motor did not ping at all. i don't want to run regular but what can I do if it is f'n up my truck. i will do more research before I decide still got a half of tank to come to a descision.

Edited April 27, 2007 by brobradh77 (see edit history)

[12'SROCK]

91 all the way for me. octane level is not going to hurt your fuel pump at all

[perk03z06]

maybe I just had bad luck but I ran 87 for 9 months and my motor did not ping at all. i don't want to run regular but what can I do if it is f'n up my truck. i will do more research before I decide still got a half of tank to come to a descision.

 

Do you regularly run your truck with your fuel tank full or empty?

[04CHASE]

running low on gas is espeacially hard on you intank pump. it will cause its life span to shorten quickly i never run with less than a 1/4 tank. also why not replace your fuel pump with a walbro 355? its 100 bucks and flows more fuel.

[brobradh77]

Do you regularly run your truck with your fuel tank full or empty?

 

I generally dont let it get below 1/8 of a tank. Why spend $100 bucks for a fuel pump while it is still under warranty? Also the octane effecting the fuel pump goes as follows in that you need to reach I believe its above 50psi for your mottor to run right and with the octane not burning right my truck is trying to fire up at 43 psi and once it starts it gets back up to 55 psi. I am no mechanic I am just going on what the chevy is telling my mechanic and what he relays to me. I just thought this might be a bit of info y'all may want to know about. Thats all.

[12'SROCK]

running low on gas is espeacially hard on you intank pump. it will cause its life span to shorten quickly i never run with less than a 1/4 tank. also why not replace your fuel pump with a walbro 355? its 100 bucks and flows more fuel.

the gas is what cools the intank fuel pump so keep some gas in there or it will run hot

Edited April 28, 2007 by 12'SROCK (see edit history)

[04CHASE]

well if its that low on fuel press most likly it is the pump. but i was assuming you had to pay 400 for it , warranty always kicks ass. but if you were in the boat with no warranty a walbro upgrade isnt a bad idea.

[gixxerrider]

I run 87 up to 91 octane and never had a problem. but then again what does pinging sound like with a loud exhaust?

[montanass]

91 for my truck... nothing less. I've heard of fuel pumps failing due to running the truck low or out of fuel, but never from running highger octane fuel. I would run 95 octane all day long if i could get it in MT, but 91 is all we get (unless of course i make a trip to the local air port or the specialty petro dealer )

[RacerJJ]

A buddy of mine is a service manager at a Chevy dealership and he told me that the pumps are notorious for going bad prematurely, however, he did not cite a reason such as bad gas. He told me that the way to fuel pump bliss is to replace the fuel filter with just about every other oil change. They're cheap and very easy to install so it may be something to look into. I'm willing to bet that there is a high percentage of people on this site that don't even know where the filter is let alone changed it! I've run 91, 100, 118 leaded, and now 110 leaded and have never had any fuel issues through 79k miles (knock on wood, of course).

Edited April 28, 2007 by RacerJJ (see edit history)

[FireRescueSS]

Any one else noticeing that most people in the early part of the run, AWD for example, say theirs will not run on anything less then high octaine, but have no compliants on fuel pumps... but the newer SS's, people are saying they have no problem with running regular, but keep losing fuel pumps. Odd, even more odd if you understand what I just said.