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Old September 2nd, 2012, 09:45 PM   #61
JohnnyJ
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Quote:
Originally Posted by whiterhino View Post
I would tell you that you could borrow my fuel pressure gauge but it's been MIA since KOH.
It got handed over to me, it's been in my truck waiting for our next lunch.
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Old September 3rd, 2012, 06:42 AM   #62
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It got handed over to me, it's been in my truck waiting for our next lunch.
I'll probably get it back just in time to load in in the toolbox for our next KOH run.
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Old September 4th, 2012, 08:52 AM   #63
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investigating now. the pump is a airtex e2000. some googling shows that people have had problems with them not flowing enough on the top end. and with the pump being so far away from the tank im guessing that it doesnt help. so for shits and giggles im going to move the pump closer to the tank today and see if it does anything. if not ill get the walbro gsl 392. and keep the e2000 as a spare.

johhny im running the stock regulator on the rail. and for power source i have not traced it back yet because this was all wired and plummed before i bought it. the only thing i changed was the tank. from a bottom feed outlet gas tank to a out the top feed fuel cell. I really think this is my issue. i think the e2000 just dont got the balls to pull it out and get it to the motor in the higher RPM range.

what you guys think?
yup. your pump is probably a bit noisy too?
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Old September 4th, 2012, 09:43 AM   #64
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I'm running an e2000 for my 5.3 (heads and cam with about 10.5:1 compression) and have no issues at all supplying enough fuel at the top end. Can't hear the pump over the exhaust and fans so it doesn't bother me.
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Old September 10th, 2012, 08:18 PM   #65
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Originally Posted by tw1st3d5 View Post
I'm running an e2000 for my 5.3 (heads and cam with about 10.5:1 compression) and have no issues at all supplying enough fuel at the top end. Can't hear the pump over the exhaust and fans so it doesn't bother me.
have you pressure tested yours?

after moving the pump it ran great for my little test. but put a guage on it and its still sitting at 48-50 psi.

what size lines are you running?
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Old September 10th, 2012, 08:32 PM   #66
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sell it and get a 5.3 fag....
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Old September 10th, 2012, 08:43 PM   #67
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sell it and get a 5.3 fag....
let me know when you can keep a tire on the rim and we will drag race
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Old September 10th, 2012, 08:48 PM   #68
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Don't listen to Erin, he's just jealous.
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Old September 10th, 2012, 09:17 PM   #69
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Quote:
Originally Posted by chevotass View Post
have you pressure tested yours?

after moving the pump it ran great for my little test. but put a guage on it and its still sitting at 48-50 psi.

what size lines are you running?
I have a fuel pressure gauge hooked up and its pretty rock steady at 58#. I run a vette reg/filter combo and it works great. -6 AN lines with a -8 pickup running to two walbro pickups.
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Old September 10th, 2012, 09:33 PM   #70
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with the engine off - pump on what is it? at idle? under load?

i can't believe the e2000 wouldn't feed it under most conditions....i could see it going lean at WOT....but it should still feed it.

Stupid question....but you don't have a plugged filter do you?
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Old September 10th, 2012, 09:35 PM   #71
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let me know when you can keep a tire on the rim and we will drag race
i cant shift mine fast enough to drag race...
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Old September 12th, 2012, 05:44 PM   #72
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Quote:
Originally Posted by alumcj View Post
with the engine off - pump on what is it? at idle? under load?

i can't believe the e2000 wouldn't feed it under most conditions....i could see it going lean at WOT....but it should still feed it.

Stupid question....but you don't have a plugged filter do you?
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?
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Old September 12th, 2012, 05:47 PM   #73
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what are you running for fuel line? sorry if it's been asked before.
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Old September 12th, 2012, 09:09 PM   #74
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looks like afew feet of rubber injection line off the fuel rails. turns to alluminium 3/8 fuel line and runs along frame rails. then changes to 5/16" injection line at fuel pump. and a few more feet of injection hose after pump to filter and tank.
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Old September 12th, 2012, 09:35 PM   #75
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If you have a return line and it has rubber hose in it, you could squeeze the return line(with a pinch off plier) a little and the pressure should go up, then try it again and if the problem is still there it could be the way the engine is running.

also check to make sure you dont have crap on the mass air flow sensor probes.
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Old September 13th, 2012, 05:40 AM   #76
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Why would the MAF have anything to do with the actual output of the fuel pump?
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Old September 13th, 2012, 06:23 AM   #77
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Quote:
Originally Posted by whiterhino View Post
Why would the MAF have anything to do with the actual output of the fuel pump?
He might be thinking that the fuel injector signal is being trimmed due to a lack of air being sensed through the MAF. Despite the TPS indicating WOT, the injector pulse signal will pull back so the engine does not flood but there is a threshold for that trim and I'm not sure what's in those tables. JohnnyJ or AlumCJ may.
However, Even with a bit less pressure than what's ideal, there's no reason the engine won't idle.
Either the injectors are plugged or their just not getting fuel. I would be good to get the engine on a streaming style TechII or programing software so you could watch and see which value is causing the engine to quit.
I think you said the rubber lines were 'fuel injection' hose. I might be suspect of some hose collapsing internally or the rail could have some debris in it. Have you gone through all those potential restrictions that would cause a lack of fuel pressure at the injectors?
Because it's running for such a short peroid after starting I suspect lack of fuel pressure once it's started usually becaue of an internal restriction not allowing fuel to maintain 'relative' high pressure.
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Old September 13th, 2012, 06:28 AM   #78
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We seem to be on 2 different pages here. IIRC, his engine is designed for 60 psi. He is only getting 48 psi at the fuel rail, which has nothing to do with MAF or injectors. The fuel supply from the pump is totally independent. It's either his pump, lines or regulator but nothing to do with the engine itself.

John,
Any chance I can get my gauge from you today and I'll check mine tonight.
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Old September 13th, 2012, 06:45 AM   #79
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It wouldn't, but if at WOT the MAF had crud on the sensor it may read a leaner condition causing the system to not give enough fuel hence a lean popping.
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Old September 13th, 2012, 06:48 AM   #80
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Quote:
Originally Posted by whiterhino View Post
We seem to be on 2 different pages here. IIRC, his engine is designed for 60 psi. He is only getting 48 psi at the fuel rail, which has nothing to do with MAF or injectors. The fuel supply from the pump is totally independent. It's either his pump, lines or regulator but nothing to do with the engine itself.

John,
Any chance I can get my gauge from you today and I'll check mine tonight.
Even @ 45psi it should run for a bit, not a few seconds. A few seconds is pretty much typical of running on just the built up rail pressure. Something is telling the fuel to shut off or the fuel can't get to the injectors. I believe if you pull the vacuum line of the FPR it will spike the pressure to the max fuel pump outlet pressure
I didn't say the injectors were bad only that there might be an obstruction in the fuel delivery.
While it may be highly unlikely the plugged MAF is the root cause of the problem, longer term fuel delivery can be compromised if the engine does not 'see' enough incoming air. This trim prevents over fueling and flooding.
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Last edited by kb8ymf; September 13th, 2012 at 06:55 AM.
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