turbomr21987

Hey Guys I am new to the forum but not new to Nissans esp the S chassis.
I am currently on my 3rd S13 I have owned. I have had a pignose hatch, a beautiful convertible and now own a 91 hatch.

Anyways to my problem I am having and I am sure it is an easy fix but would like feedback from you.

Basically the car wont start, I put a new 255 in it and ever since then it has been acting like its not getting fuel and now it wont start.
I thought I might have messed up putting the pump in but double checked everything last night, pulled it all apart, put it back together and turned the key. The pump primed fine with no problem but then when I went to prime it a second time it did not go. I changed the FP fuse thinking that might be it but it still did not prime. If I turn the car over the fuel pump still will not turn on.
Is my pump bad? Could it be something else?

Eramo323

You pretty much answered your own question. Might be the fuel pump, put the stock one back in see if it works

turbomr21987

Ill have to go buy a new one, I threw the old one out and trash has since been picked up. That was really my main reason for asking didnt want to have to buy a new one if I didnt need to.

Eramo323

Double check everything before you do, check the connections going to the fuel pump and the lines, should be able to test the pump with a reachargable drill battery

turbomr21987

I checked all the connections last night and they all seemed correct but the testing with the Batt is a great idea, I will do that tonight. Thanks guys I will let you know the outcome.

fliprayzin240sx

Look up how to run a relay setup for it. It could just not be getting enough power. You can also run a 12v power direct to the pump just to check and make sure it primes when it gets power. Could potentially save the hassle of buying another pump if it works with direct power to it.

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turbomr21987

Pumps good, got my buddy who is an electrical wiz coming over to help me out tonight.
Im sure I am just missing something simple.

turbomr21987

I am getting too much fuel.
When I pull the fuse for the fuel pump the car will start until it runs out of fumes.
Once I put it back in it will flood the motor and not start.

Now I know the fuel pump does not regulate how much fuel goes into the motor so its either my FPR or the guy I had bought it from upgraded the injectors. Im guessing FPR.

Any other thoughts from anyone or am I thinking this through properly?

Eramo323

check for leaking injectors ..

turbomr21987

Like not seated properly or leaking into the cylinder?

Eramo323

remove the fuel rail then turn the engine onto the on position, most of the time it will leak with the pressure

Matt191

^I'd say check those injectors

turbomr21987

Pulled the injectors and there are two different sets of injectors in there. I also have 4 more injectrors that they guy gave me in a scrap box and and they are two different sets in there. Can someone tell me what the part number is for the stock injector or post pics of it.

Eramo323

are pictures available? stock injectors are usually JECS

turbomr21987

What's the difference between a 25 and a 29 ECU. It looks like they are both for an auto car. Do I need a manual ECU?

turbomr21987

It's throwing code 34 or detonation circuit sensor

turbomr21987

Its also throwing code 12.

Could a bad MAF prevent it from starting?

I pulled all the injectors put all the same ones in and they are fine.

Any suggestions electronicly?

The guy swapped the original auto car to a manual and put a 98 motor in it and I think he messed something up.

turbomr21987

I have a 91 chassis and a 98 motor.
My MAF is a 91 MAF, can i run a 91 MAF on a 98 motor?

iamtheyi

no. obd1 vs obd2.

also, maf won't keep the car from starting. it will keep it from running.

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turbomr21987

Can someone list off everything that would prevent a start.
I know the Air, fuel, spark so please dont give me that.
Its got spark, I got fuel (enough to where if I pull the plugs out they are wet with fuel)
Air is there its an NA car.

iamtheyi

starter. FAT vacuum leak. That's it after everything you just mentioned.

Why would your plugs be wet with fuel if your plugs are sparking? Doesn't that sound fucking retarded?

Maybe you have leaky injectors.

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turbomr21987

Yes it does, but if I can see them sparking doesnt that say they should spark in the cylinder?

Ive never heard of a car not starting cause the plugs are going bad only not doing well under load.

jr_ss

Weak spark will easily be over powered by the amount of fuel you say you have going in to the cylinders. Have you checked the spray pattern? If you're getting a stream instead of a fan pattern you have issue with your injectors and they need to be cleaned/tested and/or replaced.

It would also help to note what motor we are dealing with... I'm assuming KA but that doesn't mean anything.

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iamtheyi

I concur with Jr's analysis of the situation. What kind of spark plugs and wires are you running? Also motor too. Was assuming KA.

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turbomr21987

Thanks guys, I will be replacing the plugs and wires tonight as well as the injector o rings just in case if its leaky injectors. These are all easy to replace everything and shouldnt take that long.

Also has anyone heard of the stock FPR not being big enough to regulate the walbro 255 fuel?

iveexcaped3

id stick a fuel pressure tester on the fuel line and see what kind of psi your looking at from your pump. have you swapped the maf for a known working maf? when you pulled the fuel rail off and had someone turn the key did any of the injectors leak out of the tip?

iamtheyi

I have heard of it making certain vehicles run a little richer, but it was contested by a great many people. It was really 50/50 of who had those problems. Shouldn't make a difference if all your vacuum lines are good to go.

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