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02-23-2018, 04:54 PM
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Heat soak?
Just installed new PTFE lines and was careful to keep them away from the exhaust heat. After warmup and a drive around the block (about 20 minutes), my car sputters and dies. Even when I stomp on the gas, it falls on its face. She fires right up though but I have to coast home barely touching the throttle. At first I thought one of my lines was too close to the frame rail and was kinking so I moved it and the pump (external mount) over about 2 inches. Car is still doing the same thing. The entire fuel system is new including the pickup in the tank. I'm wondering if the fuel is getting hot. The lines going to the fuel rails are insulated but I do have a small section that's exposed and it's resting right under the intake.
Here's a pic of the fuel line that I think might still be kinked? Thanks as always for the advice.
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68 Charger, 440SC, EFI, 6-speed
Last edited by J-440; 02-23-2018 at 06:14 PM.
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02-23-2018, 09:23 PM
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Sounds like a venting issue to me. Next tine it happens, unscrew the gas cap and if you hear a woos, you'll know the tank is under vacuum. How's it vented? You need a big vent for that big pump.
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Todd
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02-24-2018, 07:21 AM
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Todd has a good idea there....
I'd also suggest the pump itself may be the cause -- those pumps work hard and without a controller --- they get HOT!
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02-24-2018, 07:28 AM
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I was wondering the same thing. I’m still using the stock vent tube which has only a 1/8” ID. Would it be as simple as switching to a bigger tube or do I need something more?
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02-24-2018, 08:58 AM
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Greg could very well be right too, but I do think you vent is really small for such a high volume of fuel moving. I'd have a pressure gauge on the engine to make sure it's dropping off at the same time to rule out anything else. If the pressure is down when you lose power, unscrew the gas cap and see if the tank is under vacuum and your fuel pressure should come back quickly. That small vent may be overheating that pump pre-maturely so it may need to cool down. You could always drive the car with the cap loose and take it slow. That will add some venting and simulate a bigger vent. I'm with Greg, I've always heard you need a controller on that pump or they overheat within 60-90 minutes.
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Todd
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02-24-2018, 09:05 AM
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Good deal. I’m going to start with a bigger vent tube and work my way up. Thanks again.
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02-28-2018, 02:43 AM
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I have an Areomotive pump controller if you need one. Been sitting on a shelf for years in my warehouse
Send me a pm
Sent from my iPhone using Tapatalk
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02-28-2018, 10:34 AM
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Heat Soak
I have been running an external A-1000 on my Pantera for over 10 years
I did have one crap out at the Reno Fernly track about 7 years back
and replaced it without issues... I street drive and track the car a lot
sometimes 100 plus miles on a weekend..plus a lot of cruising
I assume you have a return line and looks to be -10... with a regulator?
When I first put the same system on the Firebird the return line was a
-8 ... 3/8" line and I could not get the fuel pressure down... Aeromotive
said to up the size and then it was good
I am currently installing a new cell in that car with an Aeromotive A-1000
in tank pump... I talked to them about the controller listed in the instructions
They stated that it pumps so much that the fuel may get too hot as it
is being recycled too fast... mostly when you have a small amount in the tank
I am going to not do the controller as the system worked before just in tank
now... might not be your case.... if you have very little fuel in the tank
I bet it is recycling too fast and getting hot.. try filling it up and see what
happens otherwise you may in fact need their regulator
Ps... I have a filter before and after the pump as recommended by Aeromotive
Bob
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02-28-2018, 11:39 AM
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I have a -10 sending line and a -8 return. I enlarged my vent tube to 1/2” ID. I also have 2 filters, 1 before and 1 after. It’s weird bc all of this started happening as soon as I replaced the old rubber lines with newer ptfe lines. Going to take off the pump (unbolt it from the mount) and let it hang freely with no kinks and see what happens.
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02-28-2018, 12:58 PM
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Heat soak
Problem I see is rubber hoses are most of the time
a little bigger diameter than the braided type so your
flow has more than likely changed from before
Bob
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