89 caddy, ran ok before, but now it sputters intermittently and power is way
down after running some injector cleaner in a full tank of gas. Sometimes
it's running good and others it starts to run horribly. It barely stays
running at idle when running bad.
Could it be something simple like clogged fuel filter or did I screw up
something big time? I can't even find the fuel filter. Anyone have a hint as
to where it is?
Well it very well could be... I only recently bought it and it's old as the
hills. Can anyone suggest a path to troubleshoot this? Is there a place I
can disconnect the fuel into the engine to see if I get enough fuel flowing?
I'm so poor right now I can't even afford a manual so I certainly can't
afford an expensive dead fuel pump.
Well, the thinking goes that excess back pressure, caused by a plugged
fuel filter, will overwork & result in the untimely death of the pump.
So far, I've only seen anecdotal evidence, but it does seem to make
Firstly and most importantly:
The electric fuel pumps, are a vane pump configuration. With an extremely
tight tolerance, which causes a high amount of heat. Similar to an air cut
off tool. Back pressure is their worst enemy!
Secondly: Putting injector cleaner in the tank, only succeeds to loosen up
all the shit, rust and water saturated dirt at the bottom of the tank. Much
of which is smaller than one micron, which the pump strainer doesn't filter
to one micron. So you've just succeeded in sending an abrasive compound
through the tank, which scratches the bakelite vanes, and the polished
cylinder. that alone causes a loss in pressure and volume.
thirdly: You just sent all the dormant garbage in the tank through, the
pump, and into the fuel filter. Scratching the internal workings of the
pump, clogging the strainer and starving the pump for fuel and causing it to
run hotter. Also, you've forced this pudding of "SHIT" into the fuel filter,
that can only filter to one micron at best, and farther down the line and
into the injectors!
Do you still think that snakeoil on the store shelves works?
What you say makes sense RK. Seems that the injector cleaner is also
the bottom of the tank sludge detacher. Anyway, I have read that
modern formulas sold in most (all?) parts of the U.S. already contain
a bit of injecotr cleaning detergents etc. Therefore, a bottle of
injector cleaner isn't likely to help anyway. Thoughts?
On Sun, 25 Jul 2004 21:55:20 -0400, "Refinish King"
There are such things as defective pumps:
Look at the Ford Focus, there is a major recall going on now, for fuel pump
replacements. They go bad by 15,000 moles. So they are trying to get the
cars in and do the job as a preventative measure. Rather than pay for a
break down claim.
At 20,000 miles, or even 2 years, I doubt you'd have a large accumulation of
sludge in the tank anyway. I think a good idea would be run that injector
cleaner in the car, every other tank full from new, to avoid any sludge
build up in the tank.
It will just go into the filter, and gas filters should be replaced every
15,000 miles with today's gasoline's.
The only things I've found that work, and don't loosen the stool in the tank
1: BG 44K $$19.00 a can
2: Penray Injector cleaner and fuel treatment $17.00 a bottle
3: Chevron Techron $4.95 a bottle, and just more of an already good additive
The others contain alcohol, which loosens the water based sludge in the
I hope this helps?
The best way to clean an injector, is to run an injector cleaning cycle or
two, with an injector cleaning kit. Anywhere from $59.95 for shit, plus
chemicals, to $1295.00 for top of the line, plus chemicals.
Thank's for the location, now I'll see if I can find it amongst all the junk
crammed in there.
I guess I can understand what the stuff may have done wrong. Damn, why must
I get screwed by trying to be proactive... This sucks.
What can be so special about a fuel pump anyway? Why couldn't I put in some
cheap off the shelf generic fuel electric pump or why would any pump need to
be specific to the car or expensive as you are describing? I can see the
original part being specific but wouldn't any v8 capable pump work as a
replacement or is this all tied into the computer or some suck thing?
Oh hell, maybe injectors are all messed up too... And of course I'd have no
way to test or clean them myself and I'm guessing the $59 injector cleaning
kit probably won't work worth a darn anyway correct?
If I pulled them (the injectors ) myself would any shop or store be able to
clean them or test them out of the vehicle to help save my ignorant broke
Not sounding good. I can't afford all this , not at the going shop rates or
the parts prices you folks quoted that's for sure.
I am so bummed out. Now I have a new dead clunker to keep the astro company
that it was supposed to replace is what this sounds like... Until I can find
a way to either get this fixed cheap or do some of it myself or drive it off
It's such a pretty car, for an old piece of junk. At least it will look nice
as it sits dead in the driveway. Someone just shoot me.
thanks for the help though folks, bad news or good it's better than not
having a clue where to start. I guess an old caddy is better left to someone
that owns their own shop or just wants a lawn ornament?
excuse me while I go kick my own ass.
we put a Holley electric fuel pump on my buddy's 72 Nova. When you
power it up, it sounds like a friggin' blender with a full load of ice
cubes. (ok, not THAT bad, but it's bloody loud.) That is one reason
why GM (and others) put the pump in the tank - muffles the noise and
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