Fuel pressure/heat issue-Aeromotive - Team Camaro Tech
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post #1 of 12 (permalink) Old May 9th, 14, 09:04 PM Thread Starter
Bennie
 
Join Date: Dec 2008
Location: North Carolina
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Fuel pressure/heat issue-Aeromotive

I just completed a LS3 conversion on my 67í Camaro. Now I have a fuel pressure/heat issue. The car runs great until you are down to half tank of fuel. Then you lose fuel pressure the engine leans out and shuts off. You can wait about ten mins (for fuel to cool) then start the car and you can drive a few miles until it happens again or fill the tank back up and your good to go. I have the Aeromotive stealth fuel tank for 67-68 F-body. I also have the Aeromotive fuel filter, regulator, fuel hose, fuel fittings and wiring kit. The fuel tank has the 340 stealth fuel pump. Fuel pressure is at 60psi, the tank is vented, regulator is mounted close to the fuel tank and has the return line to tank. All electrical is well grounded. I have called Aeromotive and they suggest moving the regulator to the engine bay. Before I start moving things I wanted to know if anyone else is having related issues.

Bennie D
67 Camaro
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post #2 of 12 (permalink) Old May 10th, 14, 06:45 AM
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Steiner
 
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Re: Fuel pressure/heat issue-Aeromotive

What size power wire and ground wire was run to the pump?

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #3 of 12 (permalink) Old May 10th, 14, 07:05 AM
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Steiner
 
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Re: Fuel pressure/heat issue-Aeromotive

Quote:
Originally Posted by Steiner View Post
What size power wire and ground wire was run to the pump?
Nevermind, looked up the wiring kit and it says 10AWG. Looked up the pump specs and it looks like it draws about 16A at 60psi.

Going to throw this out there as a possible option just based on symptoms. I may be way off....

Losing pressure only when the tank drops to a certain level if everything else is good will a lot of times point to a weak pump. When the tank is full, all the extra volume of fuel is "pushing" against the pump inlet and helping out. Then as you burn out the tank, the pump is not getting as much assist from the fuel volume.

Just thinking out loud here but I wonder since the wire size is borderline for that kind of continuous current at that length, maybe what is happening is the wiring it heating up enough to cause a voltage drop at the pump and causing it to lose output. This is one of the reasons they make pump controllers. If it were me, just to rule it out I'd probably make up a wire to bolt on at the pump power terminal and run it inside the car to connect to my multimeter so I could see what voltage the pump sees under normal operation and when the problem starts cropping up. That way it could be ruled out and is a fairly easy check.

Another less likely thing might be the junction hose between the pump and sending unit output inside the tank. On older cars when those hoses sometimes deteriorate, I'm thinking the same kinda thing happens. Not saying the hose is bad but a leak/split/bad crimp is always a possibility. I'm sure Aeromotive provided it with correct high pressure fuel submersible hose. Just throwing that one out there as a thing to check if you run out of options.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #4 of 12 (permalink) Old May 10th, 14, 03:22 PM
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Steps
 
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Re: Fuel pressure/heat issue-Aeromotive

Where is the pump mounted? above the height of the tank level when the issue arises
Is that pump self priming.. if not it will need to be at the bottom of the tank level

even so .. once the pump and lines to the pump have been primed the fuel should not be able to run back...which will 'unprime' the pump... and the only way the fuel can run back is u have a air leak.That is the route I would be looking at...
And 60lbs is reduculoisly high...and such high pressures/ flows are for very high end track cars.
just because these things work on track cars , very often drop the same technology onto a street car and one runs into issues... u would be very suprised just how good the old factory fuel pump really is..

PS heat will not be an issue unless the pumps its self is working way too hard too long , gets hot then vaporizes the fuel in it and then aviatrices, looses prime ....

My Spelling is not incorrect...it is creative

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post #5 of 12 (permalink) Old May 10th, 14, 04:38 PM
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Steiner
 
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Re: Fuel pressure/heat issue-Aeromotive

60psi is stock fuel pressure for an LS3 which is what he's running.
The pump is inside the tank with the Aeromotive setup.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #6 of 12 (permalink) Old May 10th, 14, 05:05 PM Thread Starter
Bennie
 
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Re: Fuel pressure/heat issue-Aeromotive

Not sure if this matters but the battery and fuel relays are located in the trunk. I do like the idea of monitoring the voltage.
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post #7 of 12 (permalink) Old May 11th, 14, 06:59 AM
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Re: Fuel pressure/heat issue-Aeromotive

The issue is the amount of power the pump consumes... the 340 pump draws a lot of current. A typical 255lph pump will support 550-600rwhp. If you are under that amount use a 255pump. It draws much less power & therefore puts less heat in the fuel to help prevent the vapor lock condition you are experiencing. The fuel is just getting hot. I would assume you have to run the car for at least 1/2 hr before the problem crops up.
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post #8 of 12 (permalink) Old May 28th, 14, 06:27 PM
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nate
 
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Re: Fuel pressure/heat issue-Aeromotive

I agree, you bought or someone sold you too large of a pump for your application. If you have the normal 430hp crate ls3, then buy or try and exchange for the 255. They are wanting you to add more fuel line to release heat from the unused fuel.
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post #9 of 12 (permalink) Old May 28th, 14, 06:37 PM
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nate
 
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Re: Fuel pressure/heat issue-Aeromotive

Did you check and clean your fuel filter before regulator? Also check if you have good flow in return line. I would clean or replace pre filter (before regulator)after first tank.
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post #10 of 12 (permalink) Old Aug 25th, 14, 06:40 PM
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Re: Fuel pressure/heat issue-Aeromotive

Any findings to report?? I am looking at getting this setup
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post #11 of 12 (permalink) Old Aug 26th, 14, 04:18 PM
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Don
 
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Re: Fuel pressure/heat issue-Aeromotive

Along the lines of the other comments , is this fuel cap or tank vented to over come the amount of fuel going out?

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #12 of 12 (permalink) Old Aug 26th, 14, 05:02 PM
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Don
 
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Re: Fuel pressure/heat issue-Aeromotive

Quote:
Originally Posted by zdld17 View Post
Along the lines of the other comments , is this fuel cap or tank vented to over come the amount of fuel going out?
my bad, I re-read the first part, tank is vented.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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