Question about 1998 Honda Civic

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Low voltage fuel pump

Voltage at fuel pump when key is turned on starts at 10. and drops to zero immediately

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  • Robert Jenkins Oct 20, 2013

    did not drop the tank. but day prior did minor tune up . cap, rotor,plugs. drove fine 15 - 20 miles then died

  • Robert Jenkins Oct 20, 2013

    fuel pump fuse is good. did tune up day before. cap, rotor, plugs. drove 15 - 20miles then died whileat intersection



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Check out for fuel pump relay or loose contacts

Posted on Oct 20, 2013


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Posted on Jan 02, 2017

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SOURCE: no voltage at fuel pump, 95 accord ex

ck all fuses? why did you drop tank down? if high mileage, poss. ign. switch problem. somewhat common.

Posted on Nov 15, 2008

  • 172 Answers

SOURCE: While driving the RPM &

Your problem sounds like a faulty ignition switch--I'm basing this on the fact that if you jiggle/hold the key in a certain way, your car will run. It should be relatively simple to swap it out.
Note that the ignition switch comes in 2 parts: (1) the lock cylinder for the key and (2) the electrical switch behind the lock cylinder. Your lock cylinder (usually, the more expensive part) is probably fine; the wear or loose wire is most likely on the electrical piece of the ignition switch.
If you're handy, this may be a self-repair--you'll need the car's key to help release the lock cylinder so you can get to the ignition switch. However, you may need to disassemble some or all of the steering column shrouding to get to the switch connectors (this will be an unplug / replace kind of item). Before doing any of that, make sure you disconnect the battery, as you don't want to accidentally cross a wire and end up with a face full of exploding air bag. If you take this to a garage, I suspect that this would not be a major repair in terms of cost.

Posted on May 09, 2011

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Replaced Fuel filter and fuel pump on my 2002 Ford Explorer Sport Trac. I have no fuel pressure. The voltage to the pump initially is there when I try to start but drops to 6 volts. What is the issue?

Make sure battery has a full charge and battery connections all good. Use a digital multi meter across battery posts, have helper turn key to crank, how far does the voltage drop? Generally it shouldn't drop below 10 volts, that spec is subjective, but, if the reading drops way down there, I'd check the battery and connections.
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1998 honda civic. fuel pump when key is turned on registers 10. volts then immediately drops to zero. did a tune up the day before. cap,rotor,plugs,oil and filter. drove 15-20 miles then died. checked fuel...

You should have close to 12 volts and then it drops to 0. That is the ecu priming the fuel system. Once you start yu should have 12v constant to the same wire. If your fuel pump is functioning ok, scan ur ecu for trouble codes. If there are no codes look into your coil and your icm in the distributor. Very commo for failure. Once the car dies, remove any spark plug wire on the plug side and put a plug into the end of it. Put the electrode of the plug close to a bolt on the valve cover and get someone to start the car, see if the plug is sparking. If it is you have a problem with fuel delivery, may not have injection pulse. You may also have a main relay failure

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Code 1684 is not on the list for Chrysler cars, code 1687 is for the battery voltage dropping below 10 volts. This can occur if the voltage actually does drop below 10 or if the battery is disconnected from the computer.
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Fuel pump replace /swap out and voltge testing

the only time you have 12 vdc is when u crank the engine. Maybe the fuel pump relay is faulty the coil for the relay is not strong enough to hold the contacts, try swapping or changing a new relay,

Jul 27, 2009 | 1999 Pontiac Montana

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Fuel pressure drops immediately to zero when engine is shut off.

I am not really familiar with the setup there but I'd be looking for a second relay to kick the pump on when cranking.

Jun 05, 2009 | 1991 Dodge Dynasty

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My 98 S10, stop and don't start anymore. the compression test is ok,but no spark....and the fuel pump have no power...that means 12 volts is interrupted in some place....but where????

first check the condition of all circuit wiring for damage. Inspect all connection to the starter motor, solenoid, ignition switch, and battery, including all ground connections. Clean and tighten all connections as required
Check the voltage drop between the negative battery terminal and the vehicle frame by placing one lead of a voltmeter on the grounded battery post (not the cable clamp) and the other lead on the frame. Turn the ignition key to the START position and note the voltage drop.
Check the voltage drop between the positive battery terminal (not the cable clamp) and the starter terminal stud. Turn the ignition key to the START position and note the voltage drop.
Check the voltage drop between the starter housing and the frame. Turn the ignition key to the START position and note the voltage drop.
If the voltage drop in any of the above is more than 1 volt, there is excessive resistance in the circuit. Clean and retest all cables not within specification. Replace as necessary.
let me know what happens

Mar 06, 2009 | 1984 Chevrolet S-10

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