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carter p5001 max fuel pressure

bp71k5

bp71k5

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Some of my TBI motor trouble appears to be due to lack of fuel pressure. After datalogging and installing a new chip, Brian at TBIChips wants to see it at 18psi.

Since I did the adjustable fuel pressure regulator mod, I turned it up to about 16.5, but it's taking lots more turns of the regulator screw to get it to go just a little higher.

Does anyone know what the max output of a carter p5001 fuel pump is? I'm thinking I might be up against it's limits.
 
Unless you've installed the 18psi regulator spring you won't be able to achieve 18psi. I bought the 18psi spring from Brian when i was datalogging for him.
 
Yep, definately less expensive. Install the 18psi spring then let the adjusting begin all over again.
 
Install the 18psi spring then let the adjusting begin all over again.
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Do you mean chip adjusting or just taking the injector cover off 10 more times to dial it into 18psi?
 
bp71k5 said:
Do you mean chip adjusting or just taking the injector cover off 10 more times to dial it into 18psi?
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Yep, removing the injector pod cover and adjusting all over again.

Also, if the fuel pump you're running only puts out 20 psi max you won't get 18 psi out of the regulator. A factory TBI pump puts out close to that and you can't usually get more than about 15 psi out of the regulator, obviously you're getting slightly more than that but i think you need a high pressure pump if you want 18 psi. When the pump is being demanding of more fuel at higher RPM's you will starve the engine.

If you haven't already ordered the spring from Brian at TBIchips you might want to ask him about the pump. I bought my high pressure pump from him, granted mine is an intank pump. He might carry a frame mouted one that is a high pressure pump that will work for you. I know you're coming down to the wire with Moab and all but i highly suggest that if you don't get this issue worked out you best not take the blazer or you'll burn up the engine i built.
 
I know you're coming down to the wire with Moab and all but i highly suggest that if you don't get this issue worked out you best not take the blazer or you'll burn up the engine i built.
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Yep, it'll be a downer but I won't be able to drive it. My BLM numbers are much better at the 16.5 psi, but I'm still getting a little pinging under load.

Here's my latest BLM numbers. It seems to be ok at idle and lower rpm, but at higher rpms it's getting a little lean. Not nearly as much as before but still lean.
 

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I would highly recommend going to a high pressure frame mounted fuel pump such as an Airtex E2000 or a Bosch 69100. They have a pretty high flow rate at 40 psi and will make more than enough volume to feed your motor at 20 psi. The Carter pump isn't designed to have a high flow rate at it's max pressure of 20 psi. So even if you can get 18.5 psi at idle it will probably won't have enough volume at high loads to maintain that pressure and will cause all kinds of wierd inconsistencies and be almost impossible to tune properly.
 
Have you looked at the P5000 ? It's higher presure for MPFI/TPI...
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Just finished plumbing the bosch in there. The p5000's even got the same wiring connector as the 5001 so I wouldn't have had to rewire it.
:doah:

I actually got a reply back from Brian at TBI chips and he thinks my BLM numbers look pretty good now with the psi at 16.5. I'm going to still run the bigger pump since I'll be able to tweak the pressure over time if needed.
 
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