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[realAgentMurdoc]

Riddle me this.

Car, fuel pump not priming.

Main relay is good.

Changed fuel pump [a used one, but was working before removed, didn't want to buy a walbro if I didn't need it and kinda wanted to stick OEM]

What the fuck could this be?  Is there some common problem that I am forgetting that could cause this?

The relay is I guess you could say getting power when the key is turned to #2 and you could feel it not when turned back to #1.  But it's not the normal click prime than click.

I'm getting mad.

93 Del Sol if that matters.

[t_cel_t]

direct wire it to the battery and see if it works

[CSaddict]

So you have power in and out of the contact side of the PGMFI relay? You can also just check power at the pump.

[TTC]

Check the switch from the ecu, I know on toyotas a signal from the maf flap triggers the ecu which turns on the fuel pump.  Do what he said, hardwire the fuel pump to the battery.

[patsmx5]

Put a meter on the wires going to the fuel pump and see if you're getting 12V with key on.

[DmC]

Check the thermostat housing ground.

[highroller54]

ef fuel pumps are grounded in the tail light circuit, my buddy spent days on this and I found it in 3 minutes.

[junkyard racer]

a multimeter is your friend on this one.

[Robb]

Ground.

[realAgentMurdoc]

thermostat ground is aokay.  ecu is good, swapped out for another.

I checked other misc grounds and all seem aokay.

lost my multimeter and can't afford one at the moment.   

I'll look into the tail light ground. 

Car has been making me really mad.  It's been like this for two weeks.  Died on me a couple times while driving, the a couple days later just flat out died no more start.  Not cool at all.

stupid shit.

[Robb]

Ive seen cheap mulimeters at Harbor Frieght for like $5.  Your pissing in the wind trying to diag an electrical problem without one. 

Even the most ching chong meow meter should get the job done.

[patsmx5]

Ive seen cheap mulimeters at Harbor Frieght for like $5.  Your pissing in the wind trying to diag an electrical problem without one. 

Even the most ching chong meow meter should get the job done.

Yeap. Borrow one if you have to. Wasting you time without a meter.

[90LSPimpin]

When you turn the car to the On position without starting it, does the check engine light come on then go off like normal, or does it just stay on?

[1slow91hf]

1156/3156 bulb with a pair of jumper wires on it to use as a makeshift test light
stick both wires into your fuel pump plug
turn key on
if it lights then its not relay or ground
if not
well then your on your own

[Robb]

1156/3156 bulb with a pair of jumper wires on it to use as a makeshift test light
stick both wires into your fuel pump plug
turn key on
if it lights then its not relay or ground
if not
well then your on your own

Uh, dude. Fuel pump pulls a LOT more current than a bulb.  It can test good with a light, but not spin the pump, ESPECIALLY if it has a bad ground. Fuel pump is one of the furthest things from the only true ground on a car, the engine block.  Fuel pump can rust and spin slower and require more current to spin, so if you have a bad ground/low current a test light will fool you.

See my comment about $5 multimeters.


 

[PhilStubbs]

1156/3156 bulb with a pair of jumper wires on it to use as a makeshift test light
stick both wires into your fuel pump plug
turn key on
if it lights then its not relay or ground
if not
well then your on your own

Uh, dude. Fuel pump pulls a LOT more current than a bulb.  It can test good with a light, but not spin the pump, ESPECIALLY if it has a bad ground. Fuel pump is one of the furthest things from the only true ground on a car, the engine block.  Fuel pump can rust and spin slower and require more current to spin, so if you have a bad ground/low current a test light will fool you.

See my comment about $5 multimeters.


 

+1 on that. i had a switch once that would flow 12v for a test light no problem, but not enough amps to light a headlight bulb. that took a while to figure out. changed the switch all was well

[HiProfile]

Given it's a del sol, one of the leakiest cars Honda ever made since the 70's, it's probably a whole lot of corrosion.

You'd want to check ALL the wires involved with the main relay. First you'll want to feed the pump +12vdc directly to possibly rule it out. The ECU is the only thing that can tell it to run the pump via one relay inside it. That's the main wire to check, rather both of them. A7 and A8 can both have green/yellow wires feeding the fuel pump relay inside the main relay.

If the pump isn't getting power, and the green/yel wires on the main relay aren't grounded, it's the ecu wires. Otherwise fuse #18 should be what feeds the internal relay's coil with +12vdc, blue/white wire, at least on a Civic.


Knowing my luck diagnosing shit, it will be something completely off the wall like a clogged pump because you run your tank dry and it (pump and/or filter) is filled with shit.

[d-rail]

Make sure your ignition switch isn't bad. I had one go out and kick on everthing but the fuel pump on a ford......

[realAgentMurdoc]

Given it's a del sol, one of the leakiest cars Honda ever made since the 70's, it's probably a whole lot of corrosion.

You'd want to check ALL the wires involved with the main relay. First you'll want to feed the pump +12vdc directly to possibly rule it out. The ECU is the only thing that can tell it to run the pump via one relay inside it. That's the main wire to check, rather both of them. A7 and A8 can both have green/yellow wires feeding the fuel pump relay inside the main relay.

If the pump isn't getting power, and the green/yel wires on the main relay aren't grounded, it's the ecu wires. Otherwise fuse #18 should be what feeds the internal relay's coil with +12vdc, blue/white wire, at least on a Civic.


Knowing my luck diagnosing shit, it will be something completely off the wall like a clogged pump because you run your tank dry and it (pump and/or filter) is filled with shit.

thanks that some goodlooking info... I say good looking cause I'm too fuckin' tired to read it all.

fuel pump is aokay, with juice it primes.  Light tested the fuel pump plug, no power.  So gotta look into the wiring.  Shit fuckin' makes me mad.  That's what I get for going jdm.

[Shitboxcrx]

http://www.tegger.com/hondafaq/mainrelay.html

[SDRAWKCAB]

Make sure your ignition switch isn't bad. I had one go out and kick on everthing but the fuel pump on a ford......

Mine when bad in my 92 hatch.

I just took it apart wires still attached. stretched out the little springs inside because they wear the little metal sliders inside and have shitty contact. My shit was intermittent like a mother fucker. Hot wire the main relay and bypass the ign switch to see if thats the problem.

[lilpooh21186]

try direct power to pin d1 fixed my problem

[7808]

ef fuel pumps are grounded in the tail light circuit, my buddy spent days on this and I found it in 3 minutes.

true.  had a ef that would randomly shut off.  found a loose ground in the tail light harness somehow

[speedjunky01]

wiring issues

strip, gallon of diesel, matches, find another one

[colt45]

^^^LOL

[d-rail]

Put a pint of Everclear in the tank. It'll run like a mitsu after that

[realAgentMurdoc]

forgot all about this.  it was a broken wire at the relay plug.  soldered in a new clip and it's been good to go.  thank goodness the wiring issue wasn't an extreme one.

[HiProfile]

You'd want to check ALL the wires involved with the main relay.

 ;D

[realAgentMurdoc]

GG dude.  I was about to rip apart the whole dash and chase wires, but decided to do a touch and test.  Found out the wire broke like half an inch from the clip, so it was a super easy fix