Question about Chevrolet C1500

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The hot feed wire for fuel tank where does it come from and how many volts should it read

Need fuse diagram for 72 c10 for wiring leads for fuel tank

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1995 chevy 1500 pickup. no power to fuel pump. possible wires got cut.need fuel pump wire diag to trace.thank you.

Posted on Aug 12, 2009

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Posted on Jan 02, 2017

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How do I fix my gauges? (Ie, gas gauge, temp gauge, speedometer, odometer)


Fuses? Blown fusible link? Most gauges work by getting 12 volts from the ignition switch when on, and getting a ground from the sender. Often the 12 volt supply wire goes to more than one so if dead, both will fail. If you have a wiring diagram, you might find which wire to cluster should be hot, and trace it backward to find the issue. Easier to check for ignition switch feed first.

Jul 01, 2015 | Cars & Trucks

2 Answers

No fuel getting to motor so no start. replaced pump fuses and relays all good. there is spark


you will need to check the plug to the pump on top of the tank. check for voltage. then if no volts trace the wires back. also you should check the relay have some one at the relay listening to see if it clicks when you turn the key. no click no volts no volts may be a warn out relay, if it buzzes change it.

Mar 20, 2014 | 1995 Plymouth Grand Voyager

1 Answer

Getting no fuel to the engine. some one zero out the computer. could not read the codes if any.


Fuel pump? If you don't hear it, you need to check if the pump has failed, or if there's a problem in the circuit to the pump. To check, pull off the fuel pump tank connector at the gas tank, and check for power on the fuel pump wire while a helper is cranking the engine over. If you have 12 volts there (can use a voltmeter or a test light), the pump has failed and need replacing. If no power when cranking engine, the fuel pump circuit will have to be diagnosed. You will need a wiring diagram of the pump circuit. It is a fused circuit, so first check the fuse. If fuse is good, find the fuel pump relay and hold a finger lightly on it while helper turns the key to on. The relay should click when key is turned to on. If it does, pull the relay out and check that the power feed for the pump is available on one terminal where the relay plugs in. Use the test light probe and check all terminals-one should be "hot at all times". If none have a signal (key is OFF), then power is lost between battery and that relay terminal. From here on, you will need a wiring diagram...Good luck.

Aug 01, 2013 | 2001 Lincoln LS

1 Answer

All power windows don't work


Dealers-hmmph.
You may have to keep looking for another broken wire. To the driver's master switch, a tan wire looks like the hot wire (feed) for the switch. And a black wire is ground, originating at the master switch and going back into the cabin with the wire harness, and then to a nearby ground source, probably behind the left kick panel. If you pull the master switch off, key on,, check for power on the tan wire terminal of the switch connector. Use a test light or a voltmeter. Now if you have a hot wire on the connector, put one volt meter lead on the hot wire terminal and the negative lead onto the black wire terminal. If ground is good, voltmeter will read battery voltage. If ground is lost, voltmeter will show nothing. Same with test light-check for a hot wire with key on. If yes, put test light lead on hot wire and use probe to touch ground-if ground is good, tester will light up. Alternatively, you could remove the left kick panel and check the security of the ground to frame there.
The only place I know for a wiring diagram would be a repair manual. Haynes manuals are about the best (about $25 at parts stores), short of a factory service manual for big bucks.
If still no luck with windows, and no hot wire with key on, pull the circuit breaker for the windows on the fuse panel under dash. With key on,. one of those terminals for the circuit breaker should show power. Ground a test light and probe both terminals to check for power. If no power there, check under hood fuses or fuse links that feed the fuse box. If CB has power available, well, that's the feed for the tan wire-sounds like either the tan wire or the black ground wire may have a break. If power to switch, check ground wire.
As a last resort, try a new circuit breaker if powered at CB terminal but nothing at driver's switch. If power is to switch on tan wire, and ground is working, consider that you may have gotten a defective master switch-not likely, but known to happen.

May 09, 2013 | 2003 Jeep Grand Cherokee

2 Answers

Replaced fuel tank and pump and now car won't start.


no engine stated.
details are based on that..
so is it still the old pump there,
this is very simple
using a volt meter. (the pump has 2 wires, measure across those)
back probe that connector to the pump. 2 pins.

12vdc cranked, if you have 12vdc cranked
but fuel pressure is 0 the pump is gone
no pump runs on 0v, or 6v, its 12vdc there,
i can not understand those fues tests
if the voltage fails to the pump it can be
the power wire or ground wire failing .
do all tests connected, or the readings will be useless.
connected is live testing, under full real conditions
and win. every time.
if ground is tested and rises to 12vdc cranked, ground is bad.
only Ohms laws here,a simple equation.

not sure why your float fails. my guess its bad.
and easy test using ohms, disconnected.
that is another problem.

ill look at your fuse, pretend V6 engine.

the service manual shows
f10 fuse is fuel pump
12vdc both side cranking is a GOOD FUSE.
note all words above.
F10 gets all power from pump relay,
so if you dont crank the relay can be off line
an F10 will be dead.
(the schematic is clear)

here is a facts on all cars, next (pure software in PCM )
  1. pump only runs 3 seconds key on, ,
  2. pump never runs, if not cranked.
  3. run cranked and all run if engine stays running.

see? and varies by year, engine, and even ECU upgrades
so a SAVVY mech always cranks to do tests.
that means its a 2 man job. sorry but that is a reality of working any car until you learn what yours does.
warning have a care here that changes rule 1 to 2, below 20F out door temps, (fun no?)

recap
crank and measure like this.
the pump has 2 wires, red hot, black ground
meter across, pins 1 to2, red back is 12vdc cranked
meter black tests lead (volts) to body perfect metal ground
and meter red lead to pin1 red shows, 12vdc cranked
12vdc means 10 to 12vdc cranked, (battery does that)
then move red test lead to pin 2, black
cranked, 0v, if see 1 volt or ore the ground called.B26 is bad.
if the pump has 12vdc on it, you hear it,
do not run it dry its fuel cooled and fuel lubricated or you wreck it.
if it is heard to run you then see fuel spec fuel pressures.
or its bad. (30psi?)



pump-f2pntdp44mjusq0choqk2alv-3-0.jpg


pump-f2pntdp44mjusq0choqk2alv-3-1.jpg

Mar 13, 2017 | 1998 Isuzu Trooper

1 Answer

2000 chevy silverado 1500 4.8 4wd will not start


Your pump is controlled by the pcm using a 12 volt signal to the relay. Pull out the relay and probe the relay socket with a voltmeter. There should be 2 terminals with 12 volts when the key is on. With the key off, there should be one 12 volt terminal coming from the ecm b fuse. See top left of diagram below.
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Jul 15, 2017 | 2000 Chevrolet Silverado

1 Answer

95 astro has no spark to the coil what next


Try this tips:
1. Check the battery voltage at the battery with the digital volt/ohm meter. Set the meter to "Volts D/C" and touch the black meter lead to the negative battery post and the red meter lead to the positive post. A fully charged battery will measure 12.7 volts or more. A measurement of 12.5 volts is considered discharged, and the battery should be charged before any further testing. Any measurement below 11 volts indicates a severely discharged battery--the battery is most likely damaged and should be replaced. If the battery measures above 12.7 volts, proceed to the next step.

2. Check the starter for battery voltage by touching the red (positive) meter lead to the battery cable terminal on the back of the starter and the black (negative) lead to the chassis. The voltage reading should be approximately the same as the measurement at the battery. If the reading is lower than battery voltage, check for bad connections at the cables on the battery and the starter or ground cable.

Check for ignition switch signal at the purple wire on the back of the starter. When the key is turned to the "Start" position this wire should measure battery voltage. If the reading is less than battery voltage, or zero volts, check the fusible links (orange wires) on the back of the starter. If the fusible links are intact and not burned or broken, replace the ignition switch. If battery voltage is present at the purple wire, and the starter doesn't turn, replace the starter. If the voltage measurements at the starter are correct, and the starter cranks the engine over when the key is turned to the start position, proceed to the next step.

3. Remove the air duct attached to the throttle body, and spray a liberal amount of the carburetor spray into the throttle body. Replace the hose, and try to start the engine. If the engine starts, the fuel pump is not supplying fuel or the ignition module is not pulsing the injectors. Check the fuel pump fuse located in the under-hood fuse block. If it is good, check for power at the fuel pump electrical connector located near the rear of the fuel tank on the driver's side of the van. In the Chevy Astro van, power is supplied to the fuel pump by the the gray wire on the electrical connector when the engine is being cranked. If power is supplied, hitting the fuel tank with the flat side of a hammer while someone else is turning the ignition key to start will sometimes bump the fuel pump enough to allow it to start. If the fuel pump checks good, proceed to the next step.

4. Check for spark. Disconnect the coil wire at the ignition coil, and try to start the engine. If no spark occurs, replace the coil and ignition module. If a strong spark occurs, plug the wire back in, and remove a spark plug wire from a spark plug and repeat the test. If a spark is not present, replace the spark plug wires, and distributor cap and rotor.


Keep us updated.

Jan 12, 2011 | 1995 Chevrolet Astro

2 Answers

199 suburban fuel pump not getting power. fuse is good relay gettin power at one terminam what could this be?


Try this: With the key off, does the relay still get power at one terminal? If yes, that is the hot lead. The relay also needs a command signal from the engine control system.
If you tell me your year model and engine, I may be able to find the wiring diagram for additional troubleshooting.

Sep 23, 2010 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

My gas gauge is really empty when it gets to half a tank is there a fuse I need to check I have an 02 s-10 blazer replaced fuel pump 2 years ago


Not a fuse if it reads any thing at all. Find the two wire harness that feeds your fuel pump and sending unit. It is near your fuel tank. It has a ground that goes to the frame near it. Unplug the connector and see what you gauge does. (key on) If you can determine the wire that becomes hot when the key is first turned on (feeds the fuel pump) put a ground to the other one to see if you get a change at your gauge.

Jul 29, 2009 | Chevrolet Blazer Cars & Trucks

1 Answer

Fuel pump inline fuse for firebird


First clarify stock ELECTRIC fuel pump in tank and you say CARBURATOR. If its not EFI , something is not right. Check for a 20A fuel pump fuse, with a 12V test light. IGN ON The oil pressure switch is on the engine block engine type unknown ). It the engine loses oil pressure (i.e. stalls) the fuel pump will shut off. Hope this helps.

Apr 12, 2009 | 1992 Pontiac Firebird

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