 fuel pump problems, 255 walbro |
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 Aug 18 2004, 03:54 PM
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#1
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 DSMCentral Freak  Group: Members Posts: 291 Joined: 6-May 04 From: Mahomet Illinois Member No.: 287  |
hey guys. i installed my 255 high pressure FP about a month ago and since then she's been idleing at 800 or less. she stalled acouple times on me while i was downshifting from 3-2. once i got off the interstate (only doing about 70-75) and she died at the stop light at the end of the off ramp. any advice on what to do would be nice.
oh i've only had this problem since i installed the new FP. -------------------- it's not a dsm unless it's leaking something
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Aug 18 2004, 04:09 PM
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#2
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 Eats and sleeps DSM jargin. Group: Members Posts: 1,035 Joined: 31-March 04 From: Chambana Member No.: 268 |
do you have a fuel pressure regulator for that pump?
-------------------- game over.
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Aug 18 2004, 04:29 PM
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#3
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 Eats and sleeps DSM jargin. Group: Members Posts: 1,985 Joined: 30-June 03 From: Peoria, IL Member No.: 150 |
QUOTE (xian 1g @ Aug 18 2004, 04:09 PM) do you have a fuel pressure regulator for that pump? I have a Walbro 255 and don't have an after market regulator, and I've never had that problem -------------------- You CAN sleep in your car, but your CAN NOT race your house!!!
------------------------------------------------------- Double Decker spoilers are uber ricerlicious!!!!  |
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Aug 18 2004, 04:47 PM
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#4
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 Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
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Aug 18 2004, 10:02 PM
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#5
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 Post Master Group: Members Posts: 908 Joined: 7-October 03 From: Chillicothe, IL Member No.: 182 |
QUOTE (natedogg @ Aug 18 2004, 04:47 PM) 100% agree with you Nate. I have one and would never look back. Though not everyone has the problems as clearly as you do, everyone that runs that pump on the stock FPR is going to overrun to some extent. An AFPR makes every aspect of tuning easier. -------------------- GVR4 866/1000 = the perpetually broken car
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Aug 19 2004, 12:35 AM
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#6
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Person of Wisdom Group: Members Posts: 227 Joined: 4-February 03 From: IA Member No.: 78 |
QUOTE (ncgalant @ Aug 18 2004, 10:02 PM) QUOTE (natedogg @ Aug 18 2004, 04:47 PM) 100% agree with you Nate. I have one and would never look back. Though not everyone has the problems as clearly as you do, everyone that runs that pump on the stock FPR is going to overrun to some extent. An AFPR makes every aspect of tuning easier. DITTO 
-------------------- '90 Talon TSi AWD
300 awhp _________________ ...here's your sign... |
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Aug 19 2004, 07:35 AM
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#7
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DSMCentral Freak Group: Members Posts: 291 Joined: 6-May 04 From: Mahomet Illinois Member No.: 287 |
wouldn't raising my idle work? cause raising the idle and getting the regulator is just flowing more fuel right?
-------------------- it's not a dsm unless it's leaking something
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Aug 19 2004, 08:14 AM
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#8
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Post Master Group: Members Posts: 908 Joined: 7-October 03 From: Chillicothe, IL Member No.: 182 |
Ok, here's what's happening...
Your flowing(lets say) 5lph to your engine at idle. Your pump is flowing 250lph. Your FPR is only meant to return 120lph and can hendle 180lph or so efficiently The extra fuel backs up in the rail and increasing your fuel pressure. Raising the idle will cause the injectors to use up some of that fuel up, but not enough to make the problem go away. Now comes the real problem. Under boost your FPR is able to work properly because your using enough fuel. Your pressure will drop to 38lbs then raise up by whatever you boost level is. Lets say your running 15psi. Your fuel pressure is now 53psi in the rail. You let off the gas and expect to idle. Your FPR is trying to make 35psi at this point, but the above situation comes into play. Now add the fact that the pressure is already to high in the rail and now, without the injectors sucking fuel is getting higher. Your injectors open back up at 1600 rpm to catch the idle only to find way to much pressure causing a rich mess. Your car chokes out and dies. How do you fix this. You get yourself an aftermarket FPR with a larger return line. -------------------- GVR4 866/1000 = the perpetually broken car
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Aug 19 2004, 09:10 AM
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#9
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Eats and sleeps DSM jargin. Group: Members Posts: 1,035 Joined: 31-March 04 From: Chambana Member No.: 268 |
well put.
-------------------- game over.
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Aug 19 2004, 10:37 AM
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#10
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DSMCentral Freak Group: Members Posts: 291 Joined: 6-May 04 From: Mahomet Illinois Member No.: 287 |
so basically i'm flooding my engine because i'm sending too much fuel? and the afpr will regulate it so that i'm not doing this. the funny thing about it is that my air/fuel gauge reads that i'm running lean when i idle...wouldn't that be a lack of fuel/fuel pressure? and does anyone have an AFPR on hand that they'd sell?
-------------------- it's not a dsm unless it's leaking something
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Aug 19 2004, 11:48 AM
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#11
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Eats and sleeps DSM jargin. Group: Members Posts: 1,035 Joined: 31-March 04 From: Chambana Member No.: 268 |
do you have a 'blinky' air/fuel gauge? if so, in my opinion those aren't very reliable and are relatively pointless. they're more of a light show than a good way to tune your car. a wide band 02, a good egt, and data logger will really tell what's going on.
that's just my .02 -------------------- game over.
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Aug 19 2004, 02:04 PM
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#12
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DSMCentral Freak Group: Members Posts: 291 Joined: 6-May 04 From: Mahomet Illinois Member No.: 287 |
it a sport - comp autometer a/f ratio gauge...it's got 22lcd's ...i guess that's the "blinky" thing...ok so AFPR = No more stalls
-------------------- it's not a dsm unless it's leaking something
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Aug 19 2004, 02:10 PM
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#13
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Post Master Group: Members Posts: 908 Joined: 7-October 03 From: Chillicothe, IL Member No.: 182 |
QUOTE (TotalEclipse97 @ Aug 19 2004, 02:04 PM) ok so AFPR = No more stalls One more question before I agree with that statement. Your recirculating your BOV right? If you venting any it will do the same thing. -------------------- GVR4 866/1000 = the perpetually broken car
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Aug 19 2004, 04:34 PM
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#14
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 Person of Wisdom Group: Members Posts: 223 Joined: 16-December 03 From: Mahomet Member No.: 213 |
yeah he's recirulating, not venting, by the way, i have a 255, and have had a 255 for about 3 months now and i'v never had the slightest problem
-------------------- 1997 Mitsubishi Eclipse GSX
1992 Honda Civic CX Hatchback Crankwalk Free is the way to be! |
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Aug 19 2004, 04:53 PM
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#15
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DSMCentral Freak Group: Members Posts: 291 Joined: 6-May 04 From: Mahomet Illinois Member No.: 287 |
Rollout...i'm thinking that since you're running a bigger everything than i am ...that's why you don't have this problem but hey i don't know.
-------------------- it's not a dsm unless it's leaking something
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Aug 20 2004, 08:06 AM
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#16
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Person of Wisdom Group: Members Posts: 223 Joined: 16-December 03 From: Mahomet Member No.: 213 |
I had a 255 when i was on the stock turbo and still had no problems
-------------------- 1997 Mitsubishi Eclipse GSX
1992 Honda Civic CX Hatchback Crankwalk Free is the way to be! |
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Aug 20 2004, 08:51 AM
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#17
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Eats and sleeps DSM jargin. Group: Members Posts: 1,035 Joined: 31-March 04 From: Chambana Member No.: 268 |
every car is different.
-------------------- game over.
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Aug 20 2004, 01:25 PM
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#18
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 Post Master Group: Members Posts: 626 Joined: 25-September 02 From: Urbana, IL Member No.: 19 |
2G's run a higher base fuel pressure stock, so they have less of a problem with overrunning the regulator.
-------------------- Eric Wort
87 White Buick Turbo 'T' (11.71 @ 116.5, 1.61 60ft, slipping trans) 92 Teal Eagle Talon TSi AWD (burn victim) |
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Aug 21 2004, 09:13 AM
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#19
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Eats and sleeps DSM jargin. Group: Members Posts: 1,035 Joined: 31-March 04 From: Chambana Member No.: 268 |
actually i believe that nate is referring to his 2g.... but, in either case, different carsrespond differently. women.
-------------------- game over.
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