Is this the correct way to install an fmu?

[AN89HATCH]

from the fpr extit fuel line, i connect that to the fmu intrance, then from the fmu exit, i connect that to the fpr exit, and i cut the vacume line going to the fpr, and t that to the fmu. is this the correct way?

[huguetpj]

from the fpr extit fuel line, i connect that to the fmu intrance, then from the fmu exit, i connect that to the fpr exit, and i cut the vacume line going to the fpr, and t that to the fmu. is this the correct way?

Just to make sure:

Fuel rail -> FPR -> FMU -> return line to tank

And yes... T off the FPRs vacuum line

[AN89HATCH]

is that the same wy to hook it up that i said? does any one have a diagram, or instructions?

[AN89HATCH]

I know some one here has to know how to hook up an fmu, I searched, but only find topics on fmu not how to install them i need help!

[huguetpj]

is that the same wy to hook it up that i said? does any one have a diagram, or instructions?

I believe it is the same but just wanted to make sure since you said " then from the fmu exit, i connect that to the fpr exit" which does not make sense to me.

So I'll brake it down. The Stock FPR is connected directly to the fuel rail. The fuel rail has two lines connected to it (center of the fuel rail). One is for fuel going into the fuel rail (from the fuel filter) the other is for fuel going back to the fuel tank (from the FPR). You need to put the FMU inline, that means cut the fuel return line and conect the line coming from the fuel rail into the FMU IN port and conect the line going to the fuel tank in the FMU OUT port.

Hope this helps

[Drift]

huguetpj, Good info. IIRC you are running the BEGI FMU. Since its adjustable, do you know approximately what fuel to boost ratio you are running - and for how much P.S.I. Secondly, do you know roughly how many threads should be above the onset screw for a fuel/boost ratio fof 7:1?

[huguetpj]

Weird... I'm pretty sure I already posted a reply on this thread....

Anyway... yep BEGI FMU, and I'm running between 4 and 9 PSI (street/track). Supposedly the FMU I've got is 7:1 and the little screw is supposed to be used for small adjustments so it won't change it much. But I've never seen my fuel pressure go past 80PSI:

80PIS - 42PSI = 38 PSI / 9 PSI = 4.2:1 aprox

Although that's ok with me since I don't like high fuel pressures. I've had the screw all the way in and all the way out and difference is very small.

By the way, I'm just using the FMU as a bandaid for the extremely lean AFRs I had before. Gonna be putting in some 550ccs soon enough.

[Drift]

Yea, I think I remember your old post. The servers went down one night. My email notification showed some other guy posted in here too, but his post I guess got deleted too. So your static pressure was set at 42PSI? Did you have the needle valve all the way closed and it still wouldn't go higher then 80PSI? Do you have an aftermarket fuel pump or inline pump? I think in your other post you said the EGT temps dropped dramatically to like 1400 deg or so. How high were they before and do you know about what your AFR was after the BEGI? (13.5 before you said). Lastly I thought all BEGI units were adjustable for any boost/fuel ratio from like 1:1 to like 18:1 or something like that? Sorry for all the ?'s, but I'm going to be running the BEGI as well until I can afford standalone - and just wanted to have as much experienced info with it as I can. Thanks.

[huguetpj]

No prob about the questions. I like answering (when able) specific questions.

So here goes:

1. I have static press set at 50PSI right now. So the stock FPR is at 42 and when it reaches 0PSI, and the FMU kicks in it jumps to 50PSI. Still need to test further with different static press to see what suits best.

2. Yep. Closed the needle valve all the way and will not go past 80-85PSI

3. Have a Walbro 255HP pump. When I used the stock pump the pump would not go past 60PSI and would drop to around 45 at redline.

4. Before I had seen my EGT gauge go all the way round. So I was running more than 1600F. At that time I thought the gauge must be faulty cause my AF gauge showed green all the way to redline. Boy was I wrong. I have not gone to the dyno after I installed the BEGI unit so no AFRs yet. Was waiting on a few things for the car before going and they I blew it up.

5. I don't think the BEGI units are adjustable like you say.

[AN89HATCH]

I am still confused:rolleyes (i guess its hard to just go by words) So do i use the line that is connected to the stock fpr at all? if so do i t into that? if so, where do I get the other line from to plug into the other port on the fmu? and will i need to t into that?

[Drift]

I am still confused:rolleyes (i guess its hard to just go by words) So do i use the line that is connected to the stock fpr at all? if so do i t into that? if so, where do I get the other line from to plug into the other port on the fmu? and will i need to t into that?

Hmm, I thought he was very clear and concise in his other post. Yes, you do use the line that goes to the stock FPR. Tee it off and run one of the lines back to the FPR and run the other line to the BEGI unit, use vacuum nozzle that doesn't have the screw attached to it, that nozzle is for the bleeder valve and isincluded in the kit. There is an "IN" port marked on the FMU. On your engine fuel setup you have one hose that has the fuel filter "inline" with the fuel rail and the other hose that doesn't have anything "inline" with it. The hose that doesn't have anything, which is the fuel return line is the one you will cut, take the part of the hose that is coming from the fuel rail FPR and connect it to the FMU IN port and connect a hose to the out port and connect that back to the fuel hardline that returns the fuel to the tank. Also depending on where you have your FMU mounted, you will probably have to get some fuel hose lines because they will need to be longer.

[AN89HATCH]

thanks i think im understanding now is this correct?

stock fuel tank---fpr-fuel rail

installing fmufuel tank----(fmu out)--fmu--(fmu in)---fpr fuel lineis this correct?

[Drift]

thanks i think im understanding now is this correct?

stock fuel tank---fpr-fuel rail

installing fmufuel tank----(fmu out)--fmu--(fmu in)---fpr fuel lineis this correct?

I don't understand that.

Stock:fuel tank > fuel pump > fuel delivery lines to fuel filter > fuel rail > FPR > fuel return line > back to fuel tank

FMU Setup:fuel tank > fuel pump > fuel delivery lines to fuel filter > fuel rail > FPR > fuel return line > *FMU* > back to fuel tank

Do you think you should still be hooking this up? :pface

[huguetpj]

Tee it off and run one of the lines back to the FPR and run the other line to the BEGI unit, ....

No. No tee's. Although you did explain it correctly, it is just the tee word :pface

AN89: Just disconnect the top line connected to the fuel rail and connect that to the OUT port of the FMU. Then get a new spare hose to connect the IN port to the fuel rail, where the previous line was supposed to be connected.

See image. The fuel line with the fuel filter inline is the feed line to the fuel rail. The line going parallel to it is the return line, the one you need to disconnect.

[AN89HATCH]

ooo isee now, so the line that you have tie wraped to the fuel filter line correct? Thanks alot for the pic! So does it matter which one goes on the in port of the fmu, and which goes on the out port? or do they do the same thing? thanks agin

[AN89HATCH]

also when i installed the fmu, the hose connecting to the fmu seems to be very loose on it, like there is play inbetween the hose, and the fuel line, if i clamp this will it be ok? what size hose did you use for the connection to the fmu, back to the fuel tank?

[s86d]

sadly I wanted to reference this host the pic on nico PLS?-Dave

[nissanfanatic]

The pic in your post didn't work for me hugetpj. But I have a vague one of my FMU setup. Kinda have to look hard, but it shows.

http://nissaninfiniticlub.net/...d.jpg

one of my "back in the day" pics.

[huguetpj]

Yep... my site is still down

[nissanfanatic]

Well if you didn't look at my thread, heres a pic of the FMU installed.



There, that should answer any questions you have about the install. Good luck.