- This topic has 52 replies, 6 voices, and was last updated 11 years, 4 months ago by
.
-
Topic
-
Hello everyone, I’m new here but I have watch many videos of Eric the car guy, lol….I also have a little knowledge of simple mechanical issues. Anyways I have a 94 Honda civic for 18 yrs so I know a little of how it works, but this time it’s eating me, lol…..
It he car has been sitting for a long time, I would turn it on n take it for a spin 1x 2x a month, I had give me fuel pump problems from sitting on old gas, after a spin around the block I would shut it off and it would start also it has shut off by itself. After waiting for a while it would start. The fuel pump would not prime, since I have never replace it n been sitting for long so I decide to replace it, come to find that it still not priming, so I check the relay (pgm-fi) main, and also replaced the fuel pump relay. Now still NOTHING, no prime.
So I did a few troubleshooting…..spark plugs, igniter,rotor, coils, and even thought that the coils had some oil when I open it, everything has spark. I also did some relay troubleshooting ,I put a continuity tester from #1 n #7 and apply 12v to the relay, #2 been my grnd and #5 been +, now I get a clicking sound like the relay its closing but no continuity between the pump and anything. Not sure if I’m doing this right, but I NEED HELP……. I have included some pictures of the relay, diagrams of relay, and top of fuel pump. Also I check for fuel pressure by turn the ignition to the on position and fuel coming out of the filter, also I forgot to to said that out of the top of the pump I’m not getting any power with or without the ignition been on, hope I have explain good so ur guys can help me, thx…rob….
-
Replies
-
First check all those fuses.there should be 12v
at 6-8 this is the coil listen for a click when
the coil is energized. you can check 7-5 with an
ohm meter. You could jumper 7-5 at the plug and
see if the fuel pump runs.Sorry College Man, and others, I was having problems with this forum and replaying to it…. But college man I try everything you suggested and nothing, the relay tested good. I go thru all my test on the relay and everything has power except the yellow n green wire that is the fuel pump. The wire from the relay/plug to the pump are good I tested them for continuity .
This relay has two contacts.
To check 1st contact;
pin 5 = 12vdc
pin 2 = ground
Put ohm meter on pins 1 and 3, meter should read near zero ohm.
IF not, contact is bad-replace relay.
To check 2nd contact;
pin 6 = 12vdc
pin 8 = ground
Put ohm meter on pins 5 and 7, meter chould read near zero ohm.
If not, contact is bad-replace relay.Try checking all three fuses that supply power to the relay.
Check pin 1 at the relay CONNECTER for 12vdc.
If 12vdc is present at pin 1- install a jumper between pin 1 and pin 7 at the relay connecter. This will apply 12vdc to fuel pump and you should hear fuel pump turn on. If you don’t hear the fuel pump turn on-leave pin 1 and pin 7 jumper, disconnect connecter at fuel pump and check for 12vdc. If 12 vdc present at fuel pump connecter- bad fuel pump. If zero vdc at fuel pump connecter, remove jumper at relay connecter pin 1 and pin 7 and ckeck wiring from relay connecter to pump fuel pump for open.[quote=”Nerves” post=54792]Sorry College Man, and others, I was having problems with this forum and replaying to it…. But college man I try everything you suggested and nothing, the relay tested good. I go thru all my test on the relay and everything has power except the yellow n green wire that is the fuel pump. The wire from the relay/plug to the pump are good I tested them for continuity .[/quote]
did you jumper 5 and 7? I’m wondering if you have a problem
with the electrical portion of the ignition switch?I have done all the checks at the relay, it’s a 2 part relay. I have the jumpers between 1 k 5, 1& 7, etc,etc. I get power everywhere except at the wire that goes to the fuel pump.
Yes I did jumper 5&7, I did all the troubleshooting at the relay and checks out good except the wire going to the pump, I’m getting spark at the spark plugs, I even did a tune up. When I turn the keys the pump not priming,, …
Ok, guys. I think I’m on to something here, I decided to unplug the computer in the car, I turn the key to the on position and touched and moved the wires/plugs a little bit and all of the sudden the pump turn on, I started the car, turn it off so I can take it for a spin and it happen again, it won’t come on, now I’m unplugging, touching, moving wires at the computer and NOTHING, What now?…..lol…
Lets assume relay is good.
Now need to check for all three 12vdc inputs and one ground to relay.
Use your volt meter with one test lead to a body gound (screw/bolt/nut).
All checks will be at relay connector/plug.Step one:
With key out — check for 12vdc at pin 1.
If 12vdc at pin 1—supply input good.
If 0vdc at pin 1—-supply input bad.Step two:
With key in; move to run/on position—- check for 12vdc at pin 1 and pin 5.
If 12vdc at pin 1 and pin 5—–supply inputs are good.
If 0vdc at pin 1 and/or pin 5——supply input bad.Step three:
With key in; move to start/crank position—–check for 12vdc at pin 1, pin 5, and pin 6.
If 12vdc at pin 1, pin 5 and pin 6 —- all supply inputs are good.
If 0vdc at pin 1, pin 5, and/or pin 6—-supply input bad.Step four:
With your meter set to ohnms.
With key out—–check pin 2 for a good connection to ground,
If near zero ohms—–good ground.
If any ohms or open—- bad ground; check wire for loose/broken connection.Have to agree with collage man. Your electrical portion of ignition switch may be bad.
BUT, a bad supply input can be also cause by a clutch interlock switch or ECU. Use your
service mannual to locate supply inputs. Look under system description–electrical connections.[quote=”Nerves” post=54869]Ok, guys. I think I’m on to something here, I decided to unplug the computer in the car, I turn the key to the on position and touched and moved the wires/plugs a little bit and all of the sudden the pump turn on, I started the car, turn it off so I can take it for a spin and it happen again, it won’t come on, now I’m unplugging, touching, moving wires at the computer and NOTHING, What now?…..lol…[/quote]
i have the same thing with a car i have in now i didnt unplug ecu but i moved the wires on the ignition switch and the pump started car run turn off re started fine left it for a day no pump no start even if i moved wires like last time. so i guess it was luck.
few things u could try if not done
diagnostic test
check earths
run a permanent live to fuel pump would rule out a few things(not a fix)
pull wire plugs out and back in to fuse box one at a time
the list goes on and onbut id guess
ecu(never seen one prime with ecu unplugged)
fuse box
earth
bad wires
relay
fuse
fuel pump[quote=”Nerves” post=54869]Ok, guys. I think I’m on to something here, I decided to unplug the computer in the car, I turn the key to the on position and touched and moved the wires/plugs a little bit and all of the sudden the pump turn on, I started the car, turn it off so I can take it for a spin and it happen again, it won’t come on, now I’m unplugging, touching, moving wires at the computer and NOTHING, What now?…..lol…[/quote]
If you touch and move wires and the pump comes on.
something is loose or frayed or not making good contact.Rubflor………I did the 12v checks the #5, & #6 are the only ones I’m having trouble with, because when I check it at the relay plug with or without the relay in, there’s no Voltage, with key in on the on/run position I get nothing, Now key in the crank/start position I get 12v, #6 it makes a click And I get nothing. I Notice that I play a little with the ignition switch/keys and its coming on and off more often but it’s on and off. So is it maybe the switch/ignition itself like COLLAGE MAN said?……
Supply inputs pin 5 and pin 6 come from ignition switch.
I would replace the the electrical portion of your ignition switch.
Follow the procedures in your service manual and disconnect your battery for safety.
Need more information about your car.
Engine size, type transmission, and 2 or 4 door.1994 Honda civic, 1.5L, 4dr, 5speed.if i can see videos, walked thru, research on how to change the electrical part of the ignition, i know i can do it myself. I mechanical incline…lol….thx for the help…
Ok. My next thing is to set it on Fire.lol…i did find that video i reviewed and ran some test on my electrical porton of my ignition and it was bad. I went and got a new hardness, i ran the same test just in case to see the different and the old one was bad, so sfter intalling it the pump primed i did it like 3x and then i went to do again and it did a click and there it is again NOTHING…Pump not priming…I don’t know what else to do.if I should change everything old relay, old fuses,everything brand new.
- You must be logged in to reply to this topic.