I recently got my a/f gauge working, and it seems i'm running a bit lean in the higher RPM range, under boost. Since I've had an in-line pump sitting in my garage for a while, I thought I should throw it on. Only problem is, I don't know which end is the inlet and which is the outlet. I've been told it's a Bosch, but it really has no markings(other than made in Germany, and 12V, etc) on it. The polarity of the electrical connections IS marked, thank god, but I'm still clueless as to which way it should be plumbed. One end(the end opposite where the electrical connections are) has a 3/8" brass barb fitting, while the other end has a 7/16" plastic fitting. The plastic fitting is molded into the endcap on the end of the pump where the electrical connections are. I really wish I had a DigiCam to show you a pic. I got this pump second-hand when I picked up my DRAG I(yah, it sucks, but it works ) kit. Anybody have any idea which way this thing goes?

Thanks in advance for any insights.

 

well for MY pump (airtex) the electrical connections were on the "EXIT" side of the pump.....and the exit was at a 90 angle.

 

The green cap is the inlet, and the blue is the outlet. Or inlet bottom, outlet where the wire terminals are at..

art

 

Word. I think all the in-line pumps I've seen have had the outlet on the side with the electrical connections too. The thing that confuses me is that the 3/8" brass fitting on my pump(opposite the electrical connections) is a 90 degree one, while the 7/16" plastic one(same side as the electrical connections) is straight.

 

cool, that's a great help, art.

 

Now that I know how to plumb it, how should I wire it? I'm sure a ground for the negative terminal should be easy enough to find, but where should I run 12v power from? It's a 97 Civic EX, D16Y8.

 

u need an automotive relay..
art had a great pic of the hookup once..
im at school, i dont have reference to it..

art.....

 

Does the stock pump have a relay? Would I maybe be able to tap into that one, or would I need an entirely new one?

 

I ran wiring to the stock relay near the stock pump and it works great!

 

So I need to run a wire all the way from the engine bay, back to where the stock pump is?

 

Crap, sorry, I mounted my inline near the gas tank and ran the lines up to the stock connections.

 

I also have my pump under the car mounted under rear set(outside of the car).
Pin 30- fused 15A to the battery.
Pin 86- to the yellow/grn wire on the harness of the fuel pump under the rear seat.
Pin 87- to the possitive terminal on the fuel pump
Pin 85- To chasis ground.


art

 

I mounted mine under the shield that protects the high pressure lines. It's concealed AND protected...HTH

 

Excellent.
Do I need a stock relay, or is there somewhere else I can get one?
Sorry about all the questions, I'm not too good with electronics

 

You dont need another stock relay, just a bosch 12v. You should be able to find them at stereo shops or sometimes at pep boys.

art

 

Sweet.
Thanks for all the help.

 

stock pump signal wire = yellow/green stripe/2 silver dots?

I'm doing my pump install, and everything is running pretty smoothly. I have the pump mounted and plumbed, and now I'm running the wire to the stock pump harness. The only problem is: I'm not sure what wire to tap for the stock pump signal wire. There's a predominantly yellow wire with a green stripe and two silver dots, and there's a predominantly green wire with a yellow stripe and two silver dots. I assume yellow/green means predominantly yellow with a green stripe, but I just wanted to make sure so I don't blow anything up or fry something, which I'm notorious for.

 

OK, I went ahead and tapped the yellow/green wire to the stock pump, and it sounds like the in-line is working(kinda noisy). The only problem was, the car wasn't starting,a nd my fuel pressure gauge was showing 60psi . So, I thought maybe the inlet and outlets on the pump were reversed, so I swapped them, and the car started right up. Only problem is: the fuel pressure gauge on my fuel filter now reads a big fat 0, which couldn't be right, since the car was running. So, I tried adjusting the fpr, but the gauge didn't move. Then I put the lines back to stock, and it read normal again. I guess my question is: why does the in-line pump cause the gauge to read 0? Is it because I have the pump plumbed between the fuel filter and the rail? If so, how can I get it to read normally again?

This is really weird.


[Modified by inspyral, 12:47 AM 4/22/2002]

 

heh, if the pump is between the fuel filter and rail then a fuel pressure gauge at the fuel filter will be useless...

 

I see. So, I need ot put the gauge somewhere after the pump, right? Like on the opposite end of the fuel rail or something? I've seen some of the aftermarket rails with a place for a gauge on the end of the rail, and my stock rail looks like it has a brass plug on the end. Can I tap it there and stick my gauge in? Also, does the pump alter fuel pressure at all? Can I just set my fuel pressure to normal, hook up the pump, and then run it like that until I can get a gauge on the rail?

 

up, pls