I just finished installing my fuel pump. It does not leak, and it is installed correctly. It told me to tap into the fuel pump relay pin 4, but there is no pin 4, so it says put in pin 7. So I put it in pin 7. So I tested it out and it makes a loud buzz for about a second, then shuts off. Is this normal>?????? Please let me knoe quick so I can continue. THANK YOU FOR YOU TIME

 

yes that is normal.. WHen u turn the key to accerories, fuel pump should turn on, then off quickly.. WHen u turn over the ignition, fuel pump should STAY on..


[Modified by DIRep972, 7:37 AM 1/25/2002]

 

Yes, it's normal when you click your key to the ACC position. It should shut off as soon as it's pressurized.

Does it do it when you turn the key? Or just when you touch the connector to the pin?

 

Hmph, you beat me.

 

BUT IT IS REALLY LOUD!!!! LIKE IT KINDA RATTLES MY CAR?????
THANX FORT THE QUICK REPLY

 

i think that is a drawback of the inline pump that comes with the drag kit....its loud.

 

try the bosch if u think the airtex is loud.. gimme a break

 

Yeah, it kinda rattles the car a bit. If you have it bolted to the strut tower or anywhere near you are going to hear it buzz against the body. First time I had my car running I thought I forgot to put in a hose or something, kinda sounded like a huge vac leak.

The one thing I found that was quite a problem was the fact that the hose was not quite long enough to clear it of kinks, so if you have any kinks make sure you get a longer 3/4 fuel hose.

 

i guess none of you have ever heard a 300zx TT fuel pump

 

Do something like this:

 

I use hose clamp and mounted it on the strut bar, use a layer of cut rubber hose, it shouldn;t rattle...

 

You can also mount the fuel pump on the block. That will rid of all the noise you're getting from it being mounted on the firewall.

 

Also, verify that you wired the pump with the correct polarity and that it is flowing the correct direction. Pumps get REALLY loud when wired backwards or pumping against another pump!

Dustin

 

I mounted mine on one the tranny bolts - absolutely no rattles or vibrations since it's isolated by the mounts...

 

umm, why are you guys mounting the pumps in the engine bays??? Other than the safety issue, you will diminish the life of your pumps since they are most efficient at pushing and not pulling fluid.

 

Because we are discussing INLINE pumps, which PULL fuel. Ths discussion has nothing to do with INTANK pumps.

 

We are also trying to build high pressure at the fuel rail. It is much easier on both pumps if the stock pump is used to /flow/ fuel to the inline pump.. and then the inline pump builds /pressure/ in the line and rail. Else it would be forced to pressurize the /entire/ fuel line from the tank forward.

Also, these inline pumps were /not/ designed to be mounted in the fuel tank. You might want to elaborate on the safety issue... since there is none.

Dustin

 

Hey thanx everyone for the replys. I accidently reversed the negative and positive haha well it not as loud as before. I just got finished puting on the turbo and manifold. Now i gotta sleep. thanx again

 

since a pump is a pump is a pump and ALL pumps (whether they be fuel or any other median) are better pushers than pullers I would take another look at what you guys are doing. Plus, I noticed that no-one seems to be worried about the pressure drop between the two pumps. I really don't see the point in running two pumps inline for such small volume applications. If you are going to add a another pump, why not just change out your stock intank??? Just seems kinda redundant to me.

 

Because intanks can NOT handle the high fuel pressure the the FMU creates. I think you have two different things mixed up. Pressure and volume are 2 different things. A stock pump, or any intank, can flow good enough for 300whp. But it cant handle high fuel pressure.

Look at it like this. If you have a straw and you blow into it, that is the flow. Now, with your fingers pinch the end half of the diameter and now blow. It kinda hard to blow air so the pressure increases. So you have to blow harder. The inline pump works basically the same way where the stock pump can provide the volume to the inlet of the inline. But when pressure increases the inline can still flow at high pressure. Look at the specs of the highest pressure pump from walbro and you will see it will not flow anything above 85psi. http://www.autoperformanceengineerin.../fuelpump.html

clif notes: stock pump can provide the volume, as any other pump, but only inlines can handle the high fuel pressures. Dont mix up volume with pressure.

art

 

Re-read my post, thanks.

 

can you explain to me what this relay looks like and how do i count the pins ? thanks

 

I did, and had you taken any part in any fluid mechanics you would realize the problem does not lie in using two pumps inline but rather not using matched pumps. Also, there are intank pumps which will more than happily provide enough flow at the desired pressures, plus at anything over 300hp I seriously hope you aren't planning on using an FMU. But anyhow, you all know best right? Just trying to help out guys...just seems you guys are wasting money and putting yourselves in a dangerous situation needlessly.

 

I know a guy locally that has a Walbro High Pressure 255lph. In-Tank fuel pump running over 300 whp. His fuel pressure reaches well over 150 psi. and he hasn't had any problems getting enough fuel to the rail. IMO I think In-Tank pumps are just as good as the In-line pumps. Also, yes the fuel pump is supose to make that kinda noise.

 

FYI he got the inline fuel pump with his DRAG3 kit. so i dont think hes wasting his money, hes just trying to get his car up an running with the kit.