Holley's Hydramat is now shipping - fuel starve solution?

Tractionless · 09-03-2018, 03:41 PM

Quote:

Originally Posted by Hotrodz

I haven't had any issue with mine since install and I am into my second year of running it.

Thanks! Are you running a switch or the like on the secondary pump from Z1? I saw a discussion on doing so so it doesn't have to run above 3/4 tank but didn't see final word or "how-to".

Hotrodz · 09-03-2018, 04:50 PM

Quote:

Originally Posted by Tractionless

Thanks! Are you running a switch or the like on the secondary pump from Z1? I saw a discussion on doing so so it doesn't have to run above 3/4 tank but didn't see final word or "how-to".

I do not have a on off switch since it sees mostly track time. On the track even full I was getting the affects of fuel starvation once I burn five gallons of full. I know some that said they were going to do a switch but none have posted up that I know of.

Tractionless · 09-04-2018, 04:10 PM

Quote:

Originally Posted by Hotrodz

I do not have a on off switch since it sees mostly track time. On the track even full I was getting the affects of fuel starvation once I burn five gallons of full. I know some that said they were going to do a switch but none have posted up that I know of.

Ok hope someone chimes in with how they incorporated a switch.

phunk · 09-05-2018, 02:49 AM

Quote:

Originally Posted by Tractionless

Ok hope someone chimes in with how they incorporated a switch.

Cut the relay control wire, or its ground, then connect the 2 ends you created to opposite terminals of a toggle switch.

Tractionless · 09-05-2018, 08:24 AM

Quote:

Originally Posted by phunk

Cut the relay control wire, or its ground, then connect the 2 ends you created to opposite terminals of a toggle switch.

Thanks for the response; however, I'm speaking of Z1's kit which doesn't include a relay. Simply piggybacks off of the OE pump wiring, which is suspect in and of itself.

Kit Includes:

Hydramat, magnetic mounts, and associated fittings
255lph in-tank fuel pump, vibration insulator, and associated fittings
Submersible fuel line for connecting Hydramat to pump
Submersible fuel line to connect additional pump to basket with hard line
Additional fuel pump harness with connectors to splice in to your existing wiring
Constant tension fuel hose clamps
Installation manual including diagrams and instructions

phunk · 09-05-2018, 02:50 PM

Figured they included a relay.

But since they dont, you can get a fuel pump relay kit. P/N FPHWK will do it.

Tractionless · 09-06-2018, 09:25 AM

Quote:

Originally Posted by phunk

Figured they included a relay.

But since they dont, you can get a fuel pump relay kit. P/N FPHWK will do it.

For the price a relay, switch & battery harness should be included rather than piggybacking the Oe circuit. Doesn’t seem safe nor reliable especially for a street car.

Hotrodz · 09-06-2018, 09:58 AM

Quote:

Originally Posted by Tractionless

For the price a relay, switch & battery harness should be included rather than piggybacking the Oe circuit. Doesn’t seem safe nor reliable especially for a street car.

Seems like you have lots of concerns and are talking your self out of Z1 kit. You should get phunk's kit as it is top notch. Those of us that have the Z1 kit have not experience any issues or at least I have not heard of any.

Tractionless · 09-06-2018, 12:28 PM

Quote:

Originally Posted by Hotrodz

Seems like you have lots of concerns and are talking your self out of Z1 kit. You should get phunk's kit as it is top notch. Those of us that have the Z1 kit have not experience any issues or at least I have not heard of any.

Yes I do, one of which being throwing part$ at an issue which might not be the fix.

I've also yet to hear from anyone with the Z1 kit that is using it on a street car running the auxiliary pump 100% of the time.

Sputtered to Stop......Now Runs Fine.

Hotrodz · 09-06-2018, 01:24 PM

Quote:

Originally Posted by Tractionless

Yes I do, one of which being throwing part$ at an issue which might not be the fix.

I've also yet to hear from anyone with the Z1 kit that is using it on a street car running the auxiliary pump 100% of the time.

Sputtered to Stop......Now Runs Fine.

I drive mine as a sometimes daily driver. I'm not sure what the issue is other than fuel economy which I have never been concerned with, because it is a sportscar lol. What part of not being a real fix are you speaking of. There isn't anyone in this thread that has said their issue with fuel starvation was not eliminated with the kit. You are in the track section so maybe people who don't track aren't committing because they have found a fix and moved on.

Sent from my SM-G965U using Tapatalk

Rusty · 09-06-2018, 01:37 PM

Quote:

Originally Posted by Hotrodz

I drive mine as a sometimes daily driver. I'm not sure what the issue is other than fuel economy which I have never been concerned with, because it is a sportscar lol. What part of not being a real fix are you speaking of. There isn't anyone in this thread that has said their issue with fuel starvation was not eliminated with the kit. You are in the track section so maybe people who don't track aren't committing because they have found a fix and moved on.

Sent from my SM-G965U using Tapatalk

I use my Z has a DD in the summer. With phunk's kit. Both pumps have to run all the time. No issues with the pumps.

Hotrodz · 09-06-2018, 01:44 PM

Quote:

Originally Posted by Rusty

I use my Z has a DD in the summer. With phunk's kit. Both pumps have to run all the time. No issues with the pumps.

Isn't that what they are designed to do run all the time regardless if you have one or two! Really the only kit I have heard issues with is the AAM twin pump system.

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Rusty · 09-06-2018, 01:57 PM

Quote:

Originally Posted by Hotrodz

Isn't that what they are designed to do run all the time regardless if you have one or two! Really the only kit I have heard issues with is the AAM twin pump system.

Sent from my SM-G965U using Tapatalk

Yeah, both pumps have to run.

I read the thread on the AAM kit.

phunk · 09-06-2018, 02:54 PM

The concern with running the Z1 second pump full time is that the driver side of the fuel tank in a Z is generally empty during normal driving, if the fuel gauge is at 1/2 or below.

This is because the factory fuel pump housing has a venturi jet pump that is recovering fuel to the passenger side of the tank so that the fuel pump can pick it up and send it to the engine. The recovery of fuel is quicker than the consumption of fuel, thus if you were to pull over the average Z on the average drive with a 1/2 tank of fuel and open both sides of the tank, you will find that the driver side is empty and the passenger side is full.

The reason the Z suffers starvation is because the fuel sloshes to the driver side of the tank on hard turns, and then there is none for the fuel pump to grab. The venturi jet pump is literally "powered by" bypass fuel leaving the regulator. So when the pump starves, the jet pump dies also. This is why a real bad case of starvation can leave you on the side of the road even with a significant amount of fuel in the tank. If you slosh it bad enough, there is just none for the pump, and the jet pump is dead due to no fuel leaving the regulator.

The Z1 kit eliminates starvation by "supercharging" the recovery of fuel to the passenger side by pumping it there with an actual fuel pump. This will make the driver side of the tank far more prone to just being entirely empty when driving the car at 1/2 tank or below, especially on the street where you will rarely turn hard enough to slosh fuel back over to it.

Electronic fuel pumps dont have a great lifespan when they run dry because the gasoline is what cools and lubricates them.

So if you DO use your Z1 kit on the street, I would highly recommend you put a toggle switch on it so you can turn it off. On the track it should be fine as it will constantly get sloshed fuel. On the street, it will run dry for long period.

The CJM RRP is a surge can system that operates under an entirely different principle and it is normal and required that both pumps run all the time.

phunk · 09-06-2018, 02:59 PM

Quote:

Originally Posted by Tractionless

For the price a relay, switch & battery harness should be included rather than piggybacking the Oe circuit. Doesn’t seem safe nor reliable especially for a street car.

I apologize in advance because I know this has got to sound rude over the internet: But you do realize you can purchase Hydramats and fuel pumps just about anywhere right?!

09-05-2018, 02:50 PM	#51 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	Figured they included a relay. But since they dont, you can get a fuel pump relay kit. P/N FPHWK will do it. JARblue and Hotrodz like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

09-06-2018, 02:54 PM	#59 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	The concern with running the Z1 second pump full time is that the driver side of the fuel tank in a Z is generally empty during normal driving, if the fuel gauge is at 1/2 or below. This is because the factory fuel pump housing has a venturi jet pump that is recovering fuel to the passenger side of the tank so that the fuel pump can pick it up and send it to the engine. The recovery of fuel is quicker than the consumption of fuel, thus if you were to pull over the average Z on the average drive with a 1/2 tank of fuel and open both sides of the tank, you will find that the driver side is empty and the passenger side is full. The reason the Z suffers starvation is because the fuel sloshes to the driver side of the tank on hard turns, and then there is none for the fuel pump to grab. The venturi jet pump is literally "powered by" bypass fuel leaving the regulator. So when the pump starves, the jet pump dies also. This is why a real bad case of starvation can leave you on the side of the road even with a significant amount of fuel in the tank. If you slosh it bad enough, there is just none for the pump, and the jet pump is dead due to no fuel leaving the regulator. The Z1 kit eliminates starvation by "supercharging" the recovery of fuel to the passenger side by pumping it there with an actual fuel pump. This will make the driver side of the tank far more prone to just being entirely empty when driving the car at 1/2 tank or below, especially on the street where you will rarely turn hard enough to slosh fuel back over to it. Electronic fuel pumps dont have a great lifespan when they run dry because the gasoline is what cools and lubricates them. So if you DO use your Z1 kit on the street, I would highly recommend you put a toggle switch on it so you can turn it off. On the track it should be fine as it will constantly get sloshed fuel. On the street, it will run dry for long period. The CJM RRP is a surge can system that operates under an entirely different principle and it is normal and required that both pumps run all the time. 2011 Nismo#91, cv129, Rusty and 2 others like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

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