View Full Version : Aeromotive A1000 isn't keeping up...any ideas?


cjmatt
08-25-2010, 08:51 AM
My car went to the dyno this week for a tune and I get a call from the guy telling me that at around 5k rpms or so, my fuel pressure is dropping off from a static 58psi down to the 20s and that I need more pump. He wasnt aware that I had a full system on the car.

My fuel setup currently consists of a -10 intank pickup that runs to my A1000, which is mounted level with the bottom of the tank, it has 100micron filter before the pump and a 10 micron filter after as recommended, it then goes to a -8 line running to a -8 one waycheck valve and then all -8 line to my fuel rail, which are aftermarket rails with 60lb mototron injectors. after that it goes to a -6 line to an aeromotive -6 FPR then -6 back to the tank.

Does anything seem out of line here? This fuel system should be good for 7-800rwhp from what Ive read. Im not looking to make over 600. its just a stock iron shortblock

I thought maybe it could be electrical but wouldnt I be able to keep up even at 12v?

'Trust'
08-25-2010, 09:53 AM
Boost or nitrous? Which rail? Faulty pump maybe?

Aeromotive Fuel Systems
08-25-2010, 09:54 AM
Several things could be going on here. Here are few questions to help narrow it down:

1. What brand of filters and how old are they?
2. Is the tank vented and not just a vented cap?
3. How old is the pump?
4. And as you stated, what voltage is the pump seeing?
5. Is the pump powered off of a relay or factory fuel pump wiring?

cjmatt
08-25-2010, 10:17 AM
Several things could be going on here. Here are few questions to help narrow it down:

1. What brand of filters and how old are they?
They are the aeromotive filters, may have 3 hours of runtime on them

2. Is the tank vented and not just a vented cap?
Yes, tank has a dedicated vent line

3. How old is the pump?
Bought the pump new, same runtime as filters, about 3 hours. 60 miles of street driving

4. And as you stated, what voltage is the pump seeing?
Ill have to compare at the pump vs. the battery. the battery runs pretty consistently around 13.2-13.8V according to my datalogs

5. Is the pump powered off of a relay or factory fuel pump wiring?
Its a painless wiring kit in a mustang. The ECU triggers a waterproof Bosch Relay that is getting its main power from the battery mounted next to it in the trunk. All connections have been soldered and heat shrunk

answers in quote

Aeromotive Fuel Systems
08-25-2010, 10:22 AM
On the bottom of your pump there is a four digit # stamped in it. What is it? Everything sounds good from your answers but I want you to try something. I've seen filters get dirty with 100 miles of a fresh install. Not saying this is the case but always the first place I look. See if you can blow threw the paper post filter. If it's difficult to blow threw I would replace it.

cjmatt
08-25-2010, 11:32 AM
On the bottom of your pump there is a four digit # stamped in it. What is it? Everything sounds good from your answers but I want you to try something. I've seen filters get dirty with 100 miles of a fresh install. Not saying this is the case but always the first place I look. See if you can blow threw the paper post filter. If it's difficult to blow threw I would replace it.

Are the numbers on the bottom of the pump base or something I can see while its bolted down? It may take a couple days since its at a shop right now. What filter should I be checking? the 100micron or the 10 micron?

cjmatt
08-25-2010, 11:34 AM
Boost or nitrous? Which rail? Faulty pump maybe?Boosted. Im not sure which rails, they are Blue anodized. They were on the motor when I got it. I dont think its a rail issue as I am losing pressure, not gaining pressure. The regulator is mounted after the rails in the circuit.

70GS455
08-25-2010, 12:35 PM
At 58 psi fuel pressure (no boost), 8 of 60# injectors (at 100% duty cycle) require 92 gph total.

At 13.5 v and 58 psi, an A1000 can supply about 86 gph.

The fuel demand of your injectors exceeds the amount of fuel your pump can supply.

You need something like a boost-a-pump or fuelab 41401, weldon 2015, or aeromotive eliminator

Aeromotive Fuel Systems
08-25-2010, 12:37 PM
The 10 micron is the one to check. It's made of paper and is suppose to be after the pump. The number is stamped on the bottom of the pump and will require you to remove the pump to see it.

cjmatt
08-25-2010, 02:09 PM
At 58 psi fuel pressure (no boost), 8 of 60# injectors (at 100% duty cycle) require 92 gph total.

At 13.5 v and 58 psi, an A1000 can supply about 86 gph.

The fuel demand of your injectors exceeds the amount of fuel your pump can supply.

You need something like a boost-a-pump or fuelab 41401, weldon 2015, or aeromotive eliminator
thats assuming I am hitting 100% duty cycle, which I shouldnt be anywhere close to in my setup. Perhaps I should drop my base fuel pressure to 43psi where the pump can flow a little more?

Aeromotive Fuel Systems
08-25-2010, 02:42 PM
At 58 psi fuel pressure (no boost), 8 of 60# injectors (at 100% duty cycle) require 92 gph total.

At 13.5 v and 58 psi, an A1000 can supply about 86 gph.

The fuel demand of your injectors exceeds the amount of fuel your pump can supply.

You need something like a boost-a-pump or fuelab 41401, weldon 2015, or aeromotive eliminator

This information is not correct. As per our website the A1000 at 58psi flows about 725 lb/hr.

725 lb/hr / 6.2 lb per gallon = 117gph

The pump is large enough so there is another issue we have to find.

cjmatt
09-23-2010, 02:28 PM
Well, I finally got around to working on the car again, today I tossed on a brand new A1000 that a buddy had sitting around awaiting a long term project. Changed nothing else, tossed it back on the dyno and it held fine. Looks like I may have just gotten a bum pump. What do I have to do to get this thing switched out for a new one?

Aeromotive Fuel Systems
09-23-2010, 04:30 PM
Well, I finally got around to working on the car again, today I tossed on a brand new A1000 that a buddy had sitting around awaiting a long term project. Changed nothing else, tossed it back on the dyno and it held fine. Looks like I may have just gotten a bum pump. What do I have to do to get this thing switched out for a new one?

cjmatt,

I will be more than happy to check your pump out for you. What is the four digit # stamped on the bottom of your pump?

wheeljunky
09-23-2010, 04:54 PM
cjmatt,
How much gas was in the tank?running the car hard on the dyno with low gas will cause the gas to heat up.
maybe even causing pump cavitation.
Just a thought..maybe Aeromotive has some thoughts on this?
And defiantly get that pump back to them..They are very cooperative to work with.

cjmatt
09-23-2010, 11:49 PM
cjmatt,

I will be more than happy to check your pump out for you. What is the four digit # stamped on the bottom of your pump?
Ill get it for you this weekend. forgot it at the shop

6.0mustang
09-26-2010, 01:23 PM
i had this same problem at the dyno. i am running an a1000. at 4400 rpms i lost fuel pressure.
it made 493 @ 4400.
my pump started to sound like a garbage disposal.
i cant decide if i should go back with an a1000, or go with an eliminator. or even change brands all together.

wheeljunky
09-26-2010, 06:44 PM
i had this same problem at the dyno. i am running an a1000. at 4400 rpms i lost fuel pressure.
it made 493 @ 4400.
my pump started to sound like a garbage disposal.
i cant decide if i should go back with an a1000, or go with an eliminator. or even change brands all together.
Your A1000 should be able to handle it...
I also lost fuel pressure at the dyno. the tuner tried to compensate for it ..
But now that i have replumbed the system i have to much fuel..looks like im headed back to the dyno..This time i will have the right MAP sensor since NAPA couldnt get their spit together..This next tune should yield me 700 rwhp.
So your well within the limits of that pump..Give Aeromotive a call..They will work with you to get this fixed.

cjmatt
09-27-2010, 03:22 PM
cjmatt,

I will be more than happy to check your pump out for you. What is the four digit # stamped on the bottom of your pump?

Its 1008. Thank you for your help

cjmatt
09-27-2010, 03:33 PM
cjmatt,
How much gas was in the tank?running the car hard on the dyno with low gas will cause the gas to heat up.
maybe even causing pump cavitation.
Just a thought..maybe Aeromotive has some thoughts on this?
And defiantly get that pump back to them..They are very cooperative to work with.

It had about a half tank. A new pump a friend lent to me fixed the problem.

Aeromotive Fuel Systems
09-27-2010, 04:56 PM
Its 1008. Thank you for your help

Thanks for the #. You have a PM.