Fuel pump Issues(Test your car please)

[Touge180sx]

Im having some fuel pump issues I am wondering if someone with a S13+Walbro+oem wiring(Relay ect) can tell me Volts/ground what you are seeing per wire color(Please let me know wire color on fuel pump assembly side of harness and main chassis harness)
Example

Volt | Fuel pump assembly side | Chassis harness
.30V Blue/red stripe Black/white stripe

When car is at idle.

Thank you!

[Touge180sx]

No one can take 5 min and test their car?

[xpertsnowcarver]

Tells you in the FSM...
But just to answer your question, the voltage to your fuel pump is whatever voltage your battery is currently at, or whatever voltage your alternator is producing.
The ground is 0v when your ecu is running your fuel pump, OR same as above if not running.

This is very basic stuff dude. That's why no one is answering your question. The FSM has a troubleshoot section as well.

rezlo.com

[Touge180sx]

Well if you can find it in the fsm about where the pinout/wiring/voltage-grounds info for fuel pump please let me know. I have only found where it shows wiring for the fuel gauge.

I know it will be same voltage as battery, I want to know what wire you are seeing the volts/grounds.

If its so easy wheres the info?

[xpertsnowcarver]

...you're not looking hard enough. Have some patience, sit down, and go through the FSM. Once you figure this out, all Nissan FSMs would be the equivalent of a Dr. Seuss book.

/thread

[Ben G]

Would you like us all to measure the voltage drop and the resistance for you too?

[jspaeth]

Everybody's giving him a hard time, but I would like to hear some REAL numbers too, especially with an aftermarket fuel pump (Walbro).

To the OP, I am having strange FP problems, where the baseline (idle) FP is sometimes LOW....

This can ONLY happen if the fuel pump is not flowing enough...a boost leak at idle would cause the FP to go UP.

Usually, it is at 35-36 psi at idle.....sometimes, I look at it and it goes down to 30 psi or sometimes a bit under 30.

Now, I don't know if this "drop" carries over to when I am on the throttle, but if it does, that is AWFUL news, and could lead to leanness and boom.


So, I think it might be a wiring issue....I was told to rewire the fuel pump on its own.....

[nismolism]

better yet hey xpertsnowcarver go do it for him...lol

[xpertsnowcarver]

^^It's pretty sad huh?

Everybody's giving him a hard time

You're clearly narrowminded. Ben G, I pressume, knows exactly what I'm talking about and agrees.

You guys just want a quick spoon fed answer to your problem. You determined on your own that you think you're have a wiring issue.... want to know your next step???? Read your FSM!

WIRE COLOR => FSM
VOLTAGE => FSM
HARNESS CONNECTORS => FSM
FUSE # and TYPE => FSM
RELAY TYPE => FSM
SCHEMATIC => FSM

I even posted a diagram myself on here RECENTLY if both of you had some more patience and searched more in depth. But, I guess I'm giving a hard time, so I'll just tell you what pages too look up.

91-94 240SX FSM: EF&EC-9, EF&EC-(135-137)

Those are some "REAL" numbers, also called page numbers. Now everyone on here has some "real" numbers to work with. Need to download the FSM? Type "240sx fsm" in the google search and click the first result.

Both of you are giving yourselves a hard time. Really..

[nismolism]

agreed...done deal:goyou:

[jspaeth]

Already have the FSM, I am just saying it would be interesting to see what types of variation people are seeing in voltages.....how much of a voltage drop versus what types of dip in fuel pressure.

DB

[Touge180sx]

Wow what a bunch of douches in here, Im asking a legit question and you cant awnser it.

I dont think the fsm is going to tell about having a walbro installed, so instead of all this crap about how easy and abundant the info is either test your car and tell me, Find the info elsewhere and show me or stay out of the thread, k Thx.

Spoon feed awnser? All I ask for is you to test and tell me voltage/ground and you cant even do that.

[jspaeth]

Some people just like to be tought for no reason, don't worry about it.

It's not as straight-forward as everyone thinks, especially when you are having intermittant fp drops out of nowhere.....

I will try to do this test and post up some voltages this weekend.....I have an S14 but with S13 blacktop

[DALAZ_68]

...you're not looking hard enough. Have some patience, sit down, and go through the FSM. Once you figure this out, all Nissan FSMs would be the equivalent of a Dr. Seuss book.

/thread

quoted for awesomeness



91-94 240SX FSM: EF&EC-9, EF&EC-(135-137)

Those are some "REAL" numbers, also called page numbers. Now everyone on here has some "real" numbers to work with. Need to download the FSM? Type "240sx fsm" in the google search and click the first result.



awesome, numbers, its like, you tried or something, wierd...:)

Already have the FSM, I am just saying it would be interesting to see what types of variation people are seeing in voltages.....how much of a voltage drop versus what types of dip in fuel pressure.

DB

what would it matter about variations from others...if there numbers dont match ur fucking own, how do u know its not there shit having issues, look at the fucking FSM, check for proper FP, if its not proper check ur wiring, check ur hoses...





I dont think the fsm is going to tell about having a walbro installed, so instead of all this crap about how easy and abundant the info is either test your car and tell me, Find the info elsewhere and show me or stay out of the thread, k Thx.



ur a fucking tard, you think your the first installing this pump?
how hard is it for you to actually try, get tears out of ur eyes and sand out of ur vag and try...

[jspaeth]

Wow so many DBs out there.

Anyway if a fuel pump doesn't work period, anyone can fix that.

It's the intermittency and random FP drops that are hard to pinpoint.

And yes, using an FSM is straightforward....it just doesn't cover every little detail....that's why there are forums, to get info from people with real world experience.

[xpertsnowcarver]

.....Im asking a legit question and you cant awnser it.....

...Spoon feed awnser? All I ask for is you to test and tell me voltage/ground and you cant even do that.

Man you truly are pathetic. I just answered it twice.

I dont think the fsm is going to tell about having a walbro installed

You don't Think huh? This just goes to show how lazy you are and why people couldn't care less to answer your question. You haven't even bother to look up the pages I gave you. Look tinkerbell... and for all the other sissies that are too lazy to search and learn and love getting spoon fed...

IT DOESN'T MATTER WHETHER YOU HAVE A WALBRO OR OEM....

Voltage is the same regardless. The walbro may consume more CURRENT than an OEM, but the voltage is the same.

This is why you need to go back to school.

[DALAZ_68]

And yes, using an FSM is straightforward....it just doesn't cover every little detail....that's why there are forums, to get info from people with real world experience.

and google

s13 Walbro pump problem - Google Search (http://www.google.com/search?hl=en&q=s13+Walbro+pump+problem&aq=f&oq=&aqi)=

amazing what u can find...when u even put minimal effort

[jspaeth]

and google

s13 Walbro pump problem - Google Search (http://www.google.com/search?hl=en&q=s13+Walbro+pump+problem&aq=f&oq=&aqi)=

amazing what u can find...when u even put minimal effort


Trust me, I have like 3 or 4 forum discussions bookmarked on my computer discussing this topic.

I would just be interested to see how low people's voltage at the pump is when it starts to be unable to supply proper FP.

The fuel pump provides enough flow so that the pressure at the fuel rail COULD BE GREATER than whatever psi you want....that's why you have the FPR

So in theory, your voltage could be a bit low at the fuel pump, but it could still be providing enough flow (pressure at the rail) to keep the FP up to par.

That's why I would like to see how low people's voltage who are having FP issues are.

For example, my car dips down to like 30-31 psi occasionally.....I need to figure out if the voltage is down at the pump and if so, how much?

It's not just a simple Yes/No or Up/Down answer.


Don't tell me to go back to school, I know more fluid mechanics than you will ever know, so shut your mouth

[xpertsnowcarver]

Don't tell me to go back to school, I know more fluid mechanics than you will ever know, so shut your mouth

The only fluid mechanics you know is maybe how to do an oil change.

You may physically be 25 years of age, but you demonstrate the attitude an eight year old.

Maybe I should ask you questions that brings out your poor logic.
Are you genwuinely interested in other people's voltage drops at the FP? Our cars are up to 20 years old... why hasn't anyone posted anything about voltage drops? Is you problem really caused by these voltage drops?

You know what the answer is to a voltage drop??? A capactor. Who hooks up a capacitor to a fuel pump!? NOBODY!!


You know what Dalaz... forget it. It's pointless. These guys are just here to talk out their ass, waste our time, and increase their post count.

DALAZ and I have provided you both with enough information to help you resolve your problems.

[jspaeth]

The only fluid mechanics you know is maybe how to do an oil change.

You may physically be 25 years of age, but you demonstrate the attitude an eight year old.

Maybe I should ask you questions that brings out your poor logic.
Are you genwuinely interested in other people's voltage drops at the FP? Our cars are up to 20 years old... why hasn't anyone posted anything about voltage drops? Is you problem really caused by these voltage drops?

You know what the answer is to a voltage drop??? A capactor. Who hooks up a capacitor to a fuel pump!? NOBODY!!


You know what Dalaz... forget it. It's pointless. These guys are just here to talk out their ass, waste our time, and increase their post count.

DALAZ and I have provided you both with enough information to help you resolve your problems.

I'd ask you about your education and how many graduate fluid mechanics classes you've had but then you just might look silly.

It IS important to hear about the voltage getting to the pump....because if the pump is getting the correct voltage, then either the pump itself is going or there is some blockage along the way causing a decrease in fuel supply.

If the voltage IS low, then that means the pump may be fine, but their is a bad connection somewhere, resulting in a decrease in voltage available to the pump.

Different problems, different solutions.


You guys are just being douches......on other forums, people with real experience and know-how provide some help and actually realize that this is a non-trivial problem that can't just be answered by the FSM.


Example:

http://www.rx7club.com/showthread.php?t=451503

To the OP, I found this thread to be quite helpful....it's for an RX7, but there is great info on how to test the electrical comtributions to this problem

[DALAZ_68]

You know what Dalaz... forget it. It's pointless. These guys are just here to talk out their ass, waste our time, and increase their post count.



yeah, im done talking to a wall for today...ima go drive my car around...

[nismolism]

I'd ask you about your education and how many graduate fluid mechanics classes you've had but then you just might look silly.

It IS important to hear about the voltage getting to the pump....because if the pump is getting the correct voltage, then either the pump itself is going or there is some blockage along the way causing a decrease in fuel supply.

If the voltage IS low, then that means the pump may be fine, but their is a bad connection somewhere, resulting in a decrease in voltage available to the pump.

Different problems, different solutions.


You guys are just being douches......on other forums, people with real experience and know-how provide some help and actually realize that this is a non-trivial problem that can't just be answered by the FSM.


Example:

Other than old/faulty wiring, what causes low voltage to fuel pump? - RX7Club.com (http://www.rx7club.com/showthread.php?t=451503)

To the OP, I found this thread to be quite helpful....it's for an RX7, but there is great info on how to test the electrical comtributions to this problem

shut up...this thread shoulda been closed for beeing stupid

[Touge180sx]

You all are fucked, why dont you go drive into the wild fire.

All I was asking for is what voltage at what wire(fuel pump assembly wiring is same chassis is not), I dont have a english fsm, care to find that for me spoon feed master?

Why would I want the voltage from a car that is fucked in the first place? I was kinda thinking it would be a car that runs good, sorry I didnt make myself clear.

I was searching and didnt find anything with even similar problem so I posted,

I found this which is fucked,

Turbo magazine
Step 3
Cut the 12V wire (blue with red) and wire it (side closer to the harness) to the 12V trigger on your relay (85). Do the same with the ground wire (white with purple) to the GND trigger on your relay (86). For the wire from your harness that goes to the fuel pump, wire the normally closed on the relay (87) to the other side of your 12V wire (blue with red). For the remaining ground wire (white with purple), crimp a ring terminal and attach it to an appropriate ground location. We used the continuity function on the voltmeter to find out that the fuel pump cover was a ground. Crimp a female terminal to your feed wire and attach it to your relay.

Boost It Up - Wiring Relay - Turbo Magazine (http://www.turbomagazine.com/tech/0804_turp_fuel_system_harness/wiring_relay.html)

I got my issue fixed, I will post my specs if you would like to see.

[jspaeth]

You all are fucked, why dont you go drive into the wild fire.

All I was asking for is what voltage at what wire(fuel pump assembly wiring is same chassis is not), I dont have a english fsm, care to find that for me spoon feed master?

Why would I want the voltage from a car that is fucked in the first place? I was kinda thinking it would be a car that runs good, sorry I didnt make myself clear.

I was searching and didnt find anything with even similar problem so I posted,

I found this which is fucked,

Turbo magazine
Step 3
Cut the 12V wire (blue with red) and wire it (side closer to the harness) to the 12V trigger on your relay (85). Do the same with the ground wire (white with purple) to the GND trigger on your relay (86). For the wire from your harness that goes to the fuel pump, wire the normally closed on the relay (87) to the other side of your 12V wire (blue with red). For the remaining ground wire (white with purple), crimp a ring terminal and attach it to an appropriate ground location. We used the continuity function on the voltmeter to find out that the fuel pump cover was a ground. Crimp a female terminal to your feed wire and attach it to your relay.

Boost It Up - Wiring Relay - Turbo Magazine (http://www.turbomagazine.com/tech/0804_turp_fuel_system_harness/wiring_relay.html)

I got my issue fixed, I will post my specs if you would like to see.


Yes, I would like to hear what voltage you are actually seeing.