Possible fuel issues please help

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Jun 13, 2010 | 12:21 AM

velox65

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From: Clinton, Ok

Possible fuel issues please help

Ok here's the issue, it's seems hard to explain but I'll attempt, the car runs great for a period but then drop face first, won't pull any kinda rpms, stutters pops and so on, sometimes I can feather the gas sometimes and it'll clear up for about 3 seconds or it won't help at all, then it comes right back, my fuel pressue gauge will hold even till this thing happens then it fluctuates by 20 psi or more stupidly fast. It's stumping me. I'll try to provide more info as I get figure out how to put it into text.

Thanks

Jun 13, 2010 | 10:00 AM

velox65

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From: Clinton, Ok

Bump, need some help on this one

Jun 13, 2010 | 10:17 AM

twitchtwice

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have you ever replaced the fuel pump/ filter?

Jun 13, 2010 | 10:51 AM

velox65

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From: Clinton, Ok

Yes it has a new filter and the pump seems ok the screen isn't clogged but it's not a new unit by any means

Jun 13, 2010 | 06:24 PM

velox65

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From: Clinton, Ok

I'm thinking it may be a bad pump, any other ideas?

Jun 13, 2010 | 07:18 PM

89 formula350

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is this a joke??? if your pump is jumping around 20 psi its toast

Jun 13, 2010 | 07:42 PM

00FirebirdaREV

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From: Plainfield, IL

I would agree ^^ pump might be failing with the psi jumping around so much

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Jun 13, 2010 | 10:57 PM

ramair21

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From: Cali

Quote:

Originally Posted by velox65

The only thing that stumped me was the fact that it dosent do it consistently, will a ls1 pump work in a lt1 tank? I'll be getting one shortly

+1 for fuel pump

Jun 13, 2010 | 11:18 PM

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orangeapeel

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From: Justin, TX

When you rev the motor your fuel pressure should drop a psi or 2. at idle is SHOULD be about 59.5-60psi.

I also changed the title of the thread to get more insightful people involved. "WTF is up with my car" doesnt attract most people.

Last edited by orangeapeel; Jun 13, 2010 at 11:26 PM.

Jun 14, 2010 | 05:35 AM

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crainholio

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Quote:

Originally Posted by velox65

...my fuel pressue gauge will hold even till this thing happens then it fluctuates by 20 psi or more stupidly fast. It's stumping me. I'll try to provide more info as I get figure out how to put it into text.

Thanks

Here's a list of possible causes of fuel pressure fluctuation like you're experiencing:

1.) Solar Flares.
2.) Cosmic Radiation.
3.) Planetary Alignment.
4.) Fuel Pump Dying.
5.) Injector Failing.

Jun 14, 2010 | 05:43 AM

#12

orangeapeel

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From: Justin, TX

E. All of the above?

But seriously it could be the pump.

Jun 14, 2010 | 07:40 AM

#13

velox65

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From: Clinton, Ok

Yea the thread title in hindsight wasn't a good one, and thanks for the input everyone I figured it was a pump or injector issue but the odds of my injectors going bad at one time were nill, I'll get a pump today. Any one I should get? I'm running a lt1 pump right now

Last edited by velox65; Jun 14, 2010 at 10:38 AM.

Jun 14, 2010 | 10:29 AM

#14

joecar

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From: So.Cal.

6.) Loose/corroded wire.

Jun 14, 2010 | 12:18 PM

#15

crainholio

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Quote:

Originally Posted by velox65

Walbro makes a 255 litre/hour gerotor type pump that works very well and can keep up with your future engine plans. Check the sponsors.

Jun 15, 2010 | 04:43 PM

#16

velox65

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From: Clinton, Ok

Put a new pump in, didn't do a thing to help, possibly my fuel regulator? Or perhaps vacu line ?

Jun 15, 2010 | 08:13 PM

#17

velox65

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From: Clinton, Ok

ok did a little more work on it tonight, seems like when I pull the vacuum line off my regulator the motor evens out some. it also backfires and pops out of the exhaust, lean fuel mixture. Brand new pump and filter.