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Old 04-05-2019, 03:28 PM   #11
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Originally Posted by amc49 View Post
Different engine on early ones but missing when warmer temps is commonly an ignition problem.
Hardest thing is that its intermittent and its not throwing any codes.
Do I just start changing parts? Coil Packs?
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Old 04-06-2019, 10:29 AM   #12
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My focus does the same thing, random acts of fuel starvation symptoms, albeit only when the gauge reads there's a quarter of a tank or less of gas in it, the closer it is to E, the worse it'll tend to get. This began after changing the fuel pump to a delphi (DELPHI FG1339).

My guess, at least for my car, is that the sending unit in the new fuel pump is crap and giving me an inaccurate gas gauge reading. So does your issue ever happen when there's plenty of gas in it? I found that aftermarket parts are typically crap, especially brands from Advanced Auto/AutoZone.
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Old 04-07-2019, 12:24 AM   #13
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Man, I've used Delphi parts with zero issues before. The snap in fuel tank ring MUST remove if you replaced the old type module with the new one there. The new type has to sit flat on tank bottom, the other one snapped into the bottom. On the new type the top orients the module location and it needs to have been indexed into the correct clocking to have the level gauge work right.

'...random acts of fuel starvation symptoms, albeit only when the gauge reads there's a quarter of a tank or less of gas in it, the closer it is to E, the worse it'll tend to get.'

A perfect description of a pump going out on the early models. That is somewhat different from missing under light load that goes away with more load (deeper throttle) which is a hallmark of ignition problems on the early cars.

To other, '06 model has 4 individual coils, only the early ones had coilpacks (4 coils in one unit).
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Old 04-07-2019, 07:29 AM   #14
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Old-style pump, installed as the original was, or at least appeared to be as I watched him do it -- the guy that installed it has done many fuel pumps.

So you're basically suggesting my almost brand new pump is going bad already, that doesn't bode well for Delphi. Of course maybe it could be that $2 pronto fuel filter I put on there from RockAuto. Just replaced it with a Motorcraft.
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Old 04-07-2019, 11:28 PM   #15
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It better NOT be the old style pump as they haven't been available for years now. The number you gave was for a complete later module and the correct one.

The problem being if somebody simply changed the old pump out with a 'new' later pump ONLY but installed in the early module it IS the wrong one and the parts listings clearly say that. Your fuel troubles clearly describe that issue if it was done that way as people do it all the time and not one has pulled it off successfully yet.

You CANNOT use the later pump 'only' in an early module, it will NOT WORK. It will seem to until the fuel supply issues show up like possibly here. The pumps look close to the same but absolutely are not and the early pump is no longer sold at all.

Wouldn't nearly be the first time a fuel pump 'expert' made that mistake, they simply do not look close enough at the parts there. We get them here all the time.

If only one gallon or so of fuel in tank, you can burn up the new pump in 60 seconds trying to prime it, the pump is fuel cooled and lubricated and tears up very quickly running dry. It needs to prime up in about 10 seconds or trouble later.

Not a pump quality issue, most Delphi use Walbro pumps in them as do many other brands you think make their own pumps, they don't.
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Old 04-08-2019, 01:53 AM   #16
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Quote:
Originally Posted by DirtyDave View Post
To throw another curve ball in here, It does it more in warmer weather. It didn't do it all winter except for the odd day when it would get above 70 degrees.
Now that its warming up around here, it's happening more. Cool Mornings driving to work it never does it. Evenings when its warmer out, it stumbles occasionally.
Intermittent issues are the worst......

From lack of responses in this thread, I guess everyone is just as stumped as me? Or its in the wrong section?

I should probably just put a new fuel pump in it and see what happens
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Hardest thing is that its intermittent and its not throwing any codes.
Do I just start changing parts? Coil Packs?
By your own words, the problem seems to show up more-so in warm weather right?

I had a similar problem and it was fixed by replacing the fuel injectors (FI's) with re-man'ed units. However, do not follow me unless you have a PZEV car that has the RED colored FI's. The PZEV red FI's have a unique 12-hole spray pattern, and these are more prone to engine stumble when (1) FI's are slightly clogged (2) when outside temps are warm/hot. My car engine was perfect in winter, and stumbled in warm-hot weather.

I tried a few types of fuel system/fuel injector cleaners. None helped. The new re-maned FI's fixed me after chasing the problem for 2 years.

No, your thread is located at the correct area of this Forum. General Tech Chat is the correct place for your thread.

Gd Luck

Example of red FI's is here:
https://www.ebay.com/i/232321560970?chn=ps
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Old 04-08-2019, 10:25 AM   #17
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Quote:
Originally Posted by Marde View Post
By your own words, the problem seems to show up more-so in warm weather right?

I had a similar problem and it was fixed by replacing the fuel injectors (FI's) with re-man'ed units. However, do not follow me unless you have a PZEV car that has the RED colored FI's. The PZEV red FI's have a unique 12-hole spray pattern, and these are more prone to engine stumble when (1) FI's are slightly clogged (2) when outside temps are warm/hot. My car engine was perfect in winter, and stumbled in warm-hot weather.

I tried a few types of fuel system/fuel injector cleaners. None helped. The new re-maned FI's fixed me after chasing the problem for 2 years.

No, your thread is located at the correct area of this Forum. General Tech Chat is the correct place for your thread.

Gd Luck

Example of red FI's is here:
https://www.ebay.com/i/232321560970?chn=ps
Yes, Happens more when its 70+ degrees out.
My 06 is a pzev

Injectors partly clogged make sense since the car sat for so long.
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Old 04-08-2019, 10:31 AM   #18
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Tank and fuel pump were replaced when the car was getting put back together after sitting. No idea what pump the mech put in there.
Pump could be getting warm when fuel level is low.
I normally never run below a 1/4 tank and the gauge seems off a tad. Takes about 12 gallons to fill from the 1/4 tank mark. I think it takes 14 gal total?
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Old 04-08-2019, 07:23 PM   #19
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FYI, the pump issues I for one speak of are only in '00-'02 models.
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Old 04-09-2019, 03:30 AM   #20
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Quote:
Originally Posted by DirtyDave View Post
...Pump could be getting warm when fuel level is low...
Yep. Yes. But that does not cause the engine to bark ((unique situations exist, especially in other older cars OR in older Foci)).

Never seen any correlation with low fuel level <-to-> fuel pump failure other than general warnings (in this model year). Fuel pumps can and will live thru low fuel situations. The general rule still applies. Do not run your tank low or dry, unless your asking for higher failure rates of the pump.

Quote:
Originally Posted by DirtyDave View Post
...Takes about 12 gallons to fill from the 1/4 tank mark. I think it takes 14 gal total?
You can not put in 12 gallons while at 1/4 tank full.

The MOST I have ever put inside my 2004 PZEV steel fuel tank was 12.7 gallons. This was just after running the car with the FUEL LOW caution light ON for about 10 miles. This just happened last week.

I will guess that all 2004-2007 PZEV cars have the same fuel tank capacity. What is the total fuel capacity? -I'm not sure.
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Last edited by Marde; 04-09-2019 at 03:38 AM.
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