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Fuel Pump Volume test?


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20 replies to this topic

#1 HardcoreSoob

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Posted 12 January 2004 - 07:44 PM

Hi,

i got an 85 Subaru Brat with the 2 Barrel Hicrappy.
I've had a problem with my brat dying in turns and rough idle.

Im currently cursing the fuel pump for these problems
But i like to get some input from you guys

1)I got a rebuild kit and put everything together correctly
A) Im very mechanically inclined,so i knew what was goin on

2)The fuel level in the bowl is low regaurdless how many times
I've adjusted it.
A)many times ive adjusted it

3)Both the fuel filters have been changed
A) duh
B)is there some kind of filter inside the tank
C)fuel quality is good

4)Did a fuel psi check and came out with 2psi and the manuals
say 2.6 to 3.3
A)does this 0.6 make a difference?
B)Is there some kinda Pump Volume Specifications
C)is there some kinda of fuel pump relay that would
cause this problem
C1) If So where is it located

I know this is fairly drawn out but any help is greatly appreciated

thanx,
John Sellers

#2 torxxx

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Posted 12 January 2004 - 08:00 PM

my car is doin the same thing..
cept it aint dyin all the way.. it just bogs down real bad..
hopefully someone will answer your post cuz I got the same question

#3 archemitis

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Posted 12 January 2004 - 08:07 PM

i have 1.5 to 2 lbs of pressure on my hatch, with 194 k miles. nothing bad happens in the corners for me. seems like it would have to be the float level... even though you adjusted it. hrmmm

#4 GeneralDisorder

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Posted 12 January 2004 - 08:09 PM

My Weber does this too - the increased fuel demand on the 20 year old pump I think is too much. Your's might be bad enough to cause the hitachi problems too. I've suspected the fuel pump on mine for a while, since it's the only component of the system that hasn't been replaced with new parts. Brand new Weber, brand new filters (air and fuel), and I still have it bog down on hard left turns. I say get a new one - or a universal one with around 3 or 4 psi. If you ever go to a Weber you'll want it anyway I think.

GD

#5 GeneralDisorder

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Posted 12 January 2004 - 08:15 PM

It's not the pressure that matters - it's the volume.

You can have 1000 psi of pressure - won't matter if your volume is too low - the engine will use it all up before the pump can refill the bowl.

If you want to test volume - run it into a gallon jug till it's full and time it.....

GD

#6 junkyardgabe

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Posted 12 January 2004 - 08:26 PM

i had one doing this and it was a seep in one of the fuel line so it cut the fuel pressure down because it was sucking air in

#7 beauregaardhooligan

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Posted 12 January 2004 - 10:05 PM

It's been awhile since I rebuilt my $Hitachi, but I seem to recall there were 2 separate adjustments to the float level. IIRC there are two places to bend the tab that touches the float needle.

#8 HardcoreSoob

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Posted 12 January 2004 - 10:32 PM

well looks like im getting a new fuel pump.....well ill let all you guys know what up when i throw it in and maybe it could be the answer to your questions as well

thanx guys,
john sellers

#9 GeneralDisorder

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Posted 13 January 2004 - 03:56 AM

Awesome - I'll be very interested to hear if this solves it. It was a big concern of mine at first, but it takes a VERY hard corner to lean out on my wagon, and after the big tires and lift, I don't take corners fast enough to notice it anymore. I suspect that eventually I'll end up replacing it anyway.

GD

#10 torxxx

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Posted 13 January 2004 - 04:22 AM

see thats wierd.. it doesnt really matter on mine how fast or hard I take the turn
most left turns more then 45 degrees do it

#11 GeneralDisorder

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Posted 13 January 2004 - 04:28 AM

Well - our systems are quite different - for one I'm running a Weber and a different front fuel filter (clear type - aftermarket). And our pumps are probably different models - since your's is an EA82, and mine's an EA81. It's hard to say exactly what your problem is torxx - heck it's hard to say *exactly* what mine is - I just *feel* that it's the pump, as that's the only thing that I haven't replaced with new parts..... the chances of my float being off are extremely slim in my opinion, as the carb came directly from Weber in the kit for my exact engine model....

GD

#12 archemitis

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Posted 13 January 2004 - 09:26 AM

GD i dont think you can assume your float is set correctly ,just because it came from a factory that has guys doing it every day. everybody makes mistakes. just dont drop your needle:mad:
theyre kinda spendy

#13 torxxx

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Posted 13 January 2004 - 12:10 PM

ok, so I eiether need to replace the ****achi with another one or get a weber....

I think I may de-emission a hitachi and use that. cheaper.. heh

Anyone have a diagram of the plates that need to be fabbed to block off the ASV ports into the exhaust?

#14 archemitis

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Posted 13 January 2004 - 12:49 PM

or you can just pinch them off and weld them. thats what i did to the egr.
remember all the posts you see about webers with problems, before you go for a weber, thinking it will make your world a better place.

#15 GeneralDisorder

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Posted 13 January 2004 - 03:04 PM

Your correct - I can't *assume* anything - but like any mechanic, I'm going with the most likely problem first. I have no reason to question the float level, and I've also heard many times here on the board from people who have this same problem - and adjusting their float did nothing to fix it. Couple that with much reading on Weber carbs noting that with our stock fuel pumps we are running the wrong pressure, and since they are 20+ years old, this is even further reduced - the fuel pump looks like a very likely target for replacement.

Also add to that the fact that I have heard NO reports of incorrect float levels on factory built Weber's - I think their quality control on something like that is probably very good - considering their reputation in the market. I think we would be hearing Jeep and Toyota people screaming bloody murder if that were the case.

GD

#16 torxxx

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Posted 13 January 2004 - 03:08 PM

ya I'm leanin towards the fuel pump on my car too
19 years is pretty damn old

#17 Alexx

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Posted 21 January 2004 - 02:05 AM

I'm curious also if the fuel pump changes anything.

#18 HardcoreSoob

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Posted 21 January 2004 - 02:04 PM

well just replaced fuel pump......little better still have low float condition just got new float......seems more buoyant than the other one b/c the plastic one i got is saturated and or the float tabs are just worn out of spec........So im gonna try out this brass one today and see how it checks out.....ill holla back at yall

john sellers
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#19 HardcoreSoob

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Posted 22 January 2004 - 11:47 AM

well its works now its seem i had been adjusting the float with the needle valve spring compressed instead of uncompressed
:banghead: D'OH anyhow now im having the typical hicrappy
problem of gaining rev in left hand turns and losing them in right
now i have something else to figure out but hell at least its drivable now......
later on,
john sellers

#20 beauregaardhooligan

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Posted 22 January 2004 - 06:25 PM

John, if I recall correctly, the float needs to be adjusted with the bowl cover upside down and the float hanging.
There are also two places on the tab to bend and make adjustment.
I'll see if I can find the sheet from the rebuild kit and scan it for you.
At the very least, it sounds like you need to have a higher fuel level.

#21 HardcoreSoob

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Posted 23 January 2004 - 02:38 PM

i already checked that as well...i got the sight gauge on the float bowl zero'd perfectly so its got all the fuel it needs....now im trying to touble shoot everthing else with my vaccum gauge and adjusting timing.....when i find out everthing i ll post my findings.....maybe there is a cure

john sellers




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