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Old September 13th, 2012, 08:29 AM   #81
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48 engine off

48 engine idling

jumped to 54 under throttling from what i could see. it was hard to read but i did see it go up a bit.

14.75 volts at pump

pulled the filter and pressure made no difference.

anyone know how to check the regulator on the fuel rail?
I read that you just pull the vacuum line going to it and if there is any fuel in it, it is bad. = http://www.silveradosierra.com/vorte...ues-t9384.html
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Old September 13th, 2012, 11:11 AM   #82
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Jim,
Orriginally it wouldnt fire. That issue is resolved due to wrong factory labels on my new fuel cell. It runs great. I just noticed at wot at the dunes i was popping and misfiring. so now trying to solve the lower pressure issue so it doesnt lean out in the higher rpms.
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Old September 13th, 2012, 11:12 AM   #83
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what kind of pickup is in the tank?
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Old September 13th, 2012, 02:22 PM   #84
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Quote:
Originally Posted by chevotass View Post
Jim,
Orriginally it wouldnt fire. That issue is resolved due to wrong factory labels on my new fuel cell. It runs great. I just noticed at wot at the dunes i was popping and misfiring. so now trying to solve the lower pressure issue so it doesnt lean out in the higher rpms.
Thanks for bringing me up to speed. Now this is a whole different issue.
Flat gound? WOT only? how full was the tank? Could it be slosh like Casey is suggesting because of lack of fuel?
If that pump is only capable of 48ish that may be the issue. Can you get it to repeat? Put a gage on it while it's running. This one should be pretty easy to see.
You may also need to view the O2 sensor signal. If you're not seeing a good signal it may be leaning it out. Again a good streaming TechII will allow you to look at A/F ratio and injector pulse width and see if it's being 'told' to lean out or the fuel pump pressure is just low. I'm suspecting the latter as Whiterhino had a similar problem I believe a few years ago and a real pump fixed his problem. You also said your pressure was not up in the 60 psi range.
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Old September 13th, 2012, 02:53 PM   #85
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Thanks for bringing me up to speed. Now this is a whole different issue.
Flat gound? WOT only? how full was the tank? Could it be slosh like Casey is suggesting because of lack of fuel?
If that pump is only capable of 48ish thatISbe the issue. Can you get it to repeat? he has said it repeats Put a gage on it while it's running.he posted that info yesterday This one should be pretty easy to see.
You may also need to view the O2 sensor signal. If you're not seeing a good signal it may be leaning it out. Again a good streaming TechII will allow you to look at A/F ratio and injector pulse width and see if it's being 'told' to lean out or the fuel pump pressure is just low. I'm suspecting the latter as Whiterhino had a similar problem I believe a few years ago and a real pump fixed his problem. You also said your pressure was not up in the 60 psi range.
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These engines require more than 48 psi. period.
Possible issues
pump
regulator
pickup
lines

Nothing else will cause the low pressure at the rail.
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Old September 13th, 2012, 09:30 PM   #86
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my vote is pump, mine in my 6.0 truck did the same thing when the pump was going (all 3 times, finally found a hole in my filler neck was letting debris/saltwater in)) if yer below 50 the engine wont run well, i think 48 was around the pressure of my last failed pump and I couldn't go above like 2k rpm before it sputtering
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Old September 15th, 2012, 10:18 PM   #87
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I just read a couple posts, definitely not the whole thread, and your issue is the engine, everyone knows Gen 3's are garbage. I would suggest throwing your engine in the neatest dumpster and buying an LT5 out of a gen 4 corvette ZR1. It will solve all of your issues if my guess is correct! But, I'm just going by what I've heard on the internets so I could be wrong. Let me know how your engine swap goes!
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Old September 15th, 2012, 10:21 PM   #88
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In all serious though..... You need 400kpa of rail pressure at WOT for the engine to be happy.... 58psi for the metric challenged.
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Old September 17th, 2012, 10:17 PM   #89
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In all serious though..... You need 400kpa of rail pressure at WOT for the engine to be happy.... 58psi for the metric challenged.
Weird, I thought it needed 4 atmospheres
It really only needs whatever pressure it was WOT tuned at, assuming it was done correctly........
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Old September 20th, 2012, 07:54 PM   #90
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Finally got a chance to check mine.
At power up I can't see what it hits but it bleeds down to about 50 psi by the time I can look at it.

At idle it holds steady at 58 psi.

I checked it by myself so I couldn't see it at rev.
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Old October 2nd, 2012, 06:37 PM   #91
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well i tested the regulator. seems legit. no fuel in it. and i started with the vacuum line off and still no fuel. im wondering if the small inlets in and out of the pump and the 4 ft of 5/16 fuel line is the restriction. the fuel line off the rails is metric and seems bigger like 3/8.
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Old October 2nd, 2012, 07:03 PM   #92
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Asking a fuel pump to pull 4 ft through a 5/16 line seems pretty small. Put an in-tank pump in and be done.
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Old October 2nd, 2012, 09:09 PM   #93
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buy a boat
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Old October 3rd, 2012, 12:13 PM   #94
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im running -8, (1/2" line)....and that isn't big enough i don't think. Im going in tank!
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Old October 3rd, 2012, 06:10 PM   #95
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You should be pushing from in-tank, with -6 (-6 means 6/16, which is 3/8) from the pump forward to the rail. The OEM fuel fittings are 3/8" push locks, and 5/16 for the return, if using a corvette regulator.
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Old October 5th, 2012, 05:59 AM   #96
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starting the intake fuel pump project today. hagger did you source the walbro pickups locallly? was going to call around today and see if any shops had them in stock.
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Old October 5th, 2012, 10:27 AM   #97
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No, I ordered them online.
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Old October 5th, 2012, 10:33 AM   #98
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walbros are very restrictive also.
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Old October 5th, 2012, 11:30 AM   #99
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???? My Walbro has been kicking ass for 5 years.

oh, that's right, I'm not a 1% er like you.
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Last edited by whiterhino; October 5th, 2012 at 11:42 AM.
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Old October 5th, 2012, 11:57 AM   #100
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THey do have small inlets, but you would likely be using them in multiples. I haven't really seen issues with people starving with them.

I hate trying to plumb EFI gas tanks. Seems like there's just no good solution out there. I'm going with a TJ fuel tank in my CJ6 because I'm tired of dicking around trying to make a sump.
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