How to hotwire a Fuel pump?

[genova]

How can I provide power and how much (12V?) to the fuel pump some might call it a "Hotwire"? I need to run the pump to get it primed but I do not want to kill the battery using the starter.

[280~Master]

Just turning the key to the on position should provide power to the pump.

[sblake01]

Just turning the key to the on position should provide power to the pump.

Not on a 75-77 as they have contact points in the AFM. You'd have to turn on the key and open the flap on the AFM to run the pump provided that everything is properly hooked up and functioning. I'm not sure that's the case when I read about the problems you're having. These pumps are self priming so you really shouldn't have to 'hotwire' it anyway. Even if you've somehow lost your fuel pressure, 5 to 7 seconds of cranking should start the car if all other things are right.

[genova]

Update:

I can hear the clicking of the relay I checked with a multi meter and I have power to the pump. I heard the pump whine. No start.

next I am going to hotwire the pump and disconnect the fuel line under the hood after the Fuel filter at the rail.

Put the hose in an old gallon anti freeze bottle and try to get he gas moving in to the container by running the pump.

Hopefully I will get the system primed then re-hook up the hose and donezo:)

Does this sound like a wise plan?

I am going to take a picture of my tank,filter Fuel pump set up and post it tonight so everyone can see it. Maybe I did something wrong like hose to long or not low enough or something a novice like me would not catch.

I appreciate everyone's help and drinks on me when I work thru it.

[genova]

Here are some pics

<a href="http://s593.photobucket.com/albums/tt17/vag8r/?action=view&current=Tankpump.jpg" target="_blank"><img src="http://i593.photobucket.com/albums/tt17/vag8r/Tankpump.jpg" border="0" alt="Z pump"></a>

<a href="http://s593.photobucket.com/albums/tt17/vag8r/?action=view&current=fuelpump.jpg" target="_blank"><img src="http://i593.photobucket.com/albums/tt17/vag8r/fuelpump.jpg" border="0" alt="Z FP/FF"></a>

Edited February 13, 2009 by genova

[280~Master]

Well I can not see the pictures. The link is broke to me.

The line from the tank to the fuel pump is going to be 5/8". You should run the hose so it will loop around. Make sure you filter is placed so the arrow is going with the flow of gas. Now sometimes you will have to prime the fuel to the filter by hand. A new filter has a lot of space for that pump to fill with fuel. My pump would never pull enough to prime the pump. I always put the fuel line set-up together attach to the tank and then put a little suction on the line to get fuel through the filter being very careful not to injest any fuel. It tastes worst than a BBQed possim on Thankgiving.

[genova]

280 master I think that you hit my nail on the head. At least I hope so. I have read the chapter in the FSM on the Fuel system and double checked everything I have come to the same conclusion. I am going to work on it this week end and that is the first thing I am going to do.

I have the FSM for a 76 & the Fuel Inj. Bible down loaded off of the blue site.

I know everything is hooked up correctly.

The one thing that haunts me is that I put in a after the Fuel tank filter on the advice of some on here. They recommended the Fram G3. The nipple or outlet on my fuel tank is almost .5" how can you fit a Fram G3 and hose on to that? Is there some adapter? or do you just pull super stretch? I would rather have a see thru filter but can not find one that fits the tank. I have a G3 and the hose to install it. I am going to be under there this weekend and I can change it out if someone can tell me how to make it fit?

Any takers?

[280~Master]

Trust me I ran my Napa filter for about 3 months before I had the tank POR-15ed. I would get under there and replace it about evry 2 to 3 weeks. A Z machanic told me that he would put a race filter under there for about 100.00 or so. The problem with the G3 is the inlet/outlet size Thats why I gave the part number for the Napa filter same thing just no see through.

[genova]

The Napa filter was a keeper I managed to fix the issue it was my impeller. i took apart my Fuel pump and put it back together and whoopee it was fixed!

Thanks for your help 280z-master:-)

[280~Master]

Congrats! Hope you drive safe.

If you start to get slugish or spits and sputters under pedal increase then check you filter. Its there to stop the crap from getting to the pump and may be clogged depending on how clean your tank is.

Edited February 14, 2009 by 280~Master

[sblake01]

........I managed to fix the issue it was my impeller. i took apart my Fuel pump and put it back together and whoopee it was fixed!

Glad you got it fixed! I suspected the fuel pump but there are so many variables that can cause this beloved EFI system not to run that I didn't want to question your 'skills'. They're self priming and shouldn't take more that 5-7 seconds to start the car even when there is no fuel pressure to begin with. I've mis-assembled a couple of them it the past but I put them on my 'test bench' before I install them to avoid what you went through.

[genova]

SBlake I have no "skills" ROFLROFL Thanks for the credit though.

Hopefully one day I will!

I want to learn and I just had my first Lesson.:cheeky:

Once again thanks guys:beard: