For more info. on fuel system testing go to www.scannerdanner.com This video covers the fundamentals of fuel pump pressure, amperage, power and ground testin…
For more info. on fuel system testing go to www.scannerdanner.com This video covers the fundamentals of fuel pump pressure, amperage, power and ground testin…
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thank you so much i have the exact same symptoms on a car at work
never checked the return line pressure , maybe the 3 dollar pressure
regulator went fluie, hey how about ramping up the voltage to 15 or 20 at
the pump and get another year or two by golly. !
could you hear the pump engage when you turn the key on and it just ended
up being a bad pump? I can hear mine engage but still won’t crank. I”m
wondering if it’s possible to hear it engage and still be a bad pump?
I have 97 Chevy malibu n changed fuel pump n spark plugs. (Car worked one
day n died while driving) Got spark and relay under the hood got 12 volts .
But no power at fuel plug (+&-) plugs.. No fuel pressure at front under
hood. Could it possibly be ECU or ECM??
Good idea adding an external battery charger to keep the cranking VDC up…
question about RTV after a pierce. wouldn’t it absorb moisture? I know it
prob wouldn’t affect where you live but whats your take on RTV after a
pierce? thanks
yes, as well as with the timer tool. I have found it to be very accurate.
I’ll have to do a video on the transducer in the rail.
good video`you have instructors in spanish,iam of mexico i am mechanic
tanks.
was the 50psi to open the poppets the same across the board with the other
vortec motors? 4.8, 5.3, etc etc basically anything that uses spider
injectors, correct?
Mr Danner,i think i have a stupid question…to what ports did you hook up
your leads when doing the amperage test?
If all the injectors are clogged, you are going to have some major running
issues and severe lean misfiring which is easily identified using a scope
and watching the secondary ignition waveforms. other than that, the timer
tool is very reliable. you could also use a transducer in the fuel rail to
ID
just GM for over 15 years. fortunately they killed it.
How often do you do a volume test for a fuel pump? Would u consider it a
most when checking the fuel pressure because I know pressure may be good
but volume might show otherwise. Thanks love your videos
well as a rule of thumb a fuel pump will have an in-rush current of around
12-17A to get it spinning from static, so if you got yourself a little
library of current captures from static you would get a quick idea of the
in-rush current of a good working circuit & spot quickly one that has a
volt drop.
where did you get the adapters for the propane?
Yeah i have a 90 Probe with the fuel sender unit/pump plate under the rear
seat, and I have a 94 where they were too cheap to do the same. I would
*never* trust myself to cut out the inspection hole exactly where it needs
to be though the first time, I’d have to sacrifice one at the junkyard
first for a trial. I don’t see how you can accurately get it right the
first time.
First
Joel thanks for the comment. I don’t mind the questioning though. I think
it is a good way to expand on the topic. As long as we all stay polite and
be respectful to each other, I say the more the questioning the better the
learning
thank you,I was reading your book under common secondary failures o and
watching your video for pattern to see if injector is stock closed lean,
any way I sent you to your e-mail a shop stream capture from verus if you
have a time to see that I will appreciate your answer to get direction what
could cause that burn line to be too high
Bad fuel pump. No doubt, no questions, no guess work here.
yep
Mainly because this was a no start complaint. I made it run with propane.
So you want to match the conditionS of the car when you’re doing teSting
it shouldn’t be running at all with that psi. check it with another gauge.
Love your video! One of the best channels on YouTube period
Okay but you’re still in the same boat if current is too low.It could still
be a bad electric motor (poor brush contact etc.) or low supply voltage or
a poor ground. so you still need to check voltage to be sure.
The jumper wire is hooked to bat.neg and ran all the way to the back as
close to the tank. It provides a known good ground for the multimeter to
the two voltage tests, power and ground (while cranking).
That’s why he turned on the battery charger. Amps were still too low.
Right decision using the piercing probes if no connectors are accessible.
No point dropping the tank unless you’re absolutely sure.
does a 1998 olds bravada have a wire to check the fuel pump, if it does
where would it be. my truck just cranks but if i put starter fluid in it
turns over then shuts down. spark is good and the fuse n relay r good.
shows no pressure when i put the gauge on it. also no fuel comes out the
schrader valve. n i don’t hear the pump activate when i turn the key
Lean maybe, not rich. Rich causes low KVs. Fuel acts as a conductor
Why not run the truck while scoping the jumper wire for proper amperage?
Voltage would be higher while running.
then tell me why
Paul, do you use the ‘in-rush’ current at all in diagnosis of pumps/motors
? It can give an idea of volt drop or not …………..