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Carter P4070 Electric Fuel pump shuts off? #2636006
03/23/19 04:48 PM
03/23/19 04:48 PM
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I've installed a carter P4070 electric fuel pump on my 1969 Plymouth road runner. It is mounted at the gas tank and runs through a Holley Fuel regulator, (which has a return line) and runs to my Carter High pro. mechanical fuel pump then to the carb, which is a AVS2 650 Edlebrock. The problem is the electric pump shuts off once the car is running, I don't know what is causing this, I have the electric pump wired using an oil pressure safety switch and I have good oil pressure. This is the 2nd Carter P4070 I have installed as well as the 2nd fuel pressure regulator, there has been no change, the electric fuel pump shuts off at some point after the car is running, am I missing something obvious? Thanks, 6T9RR

Re: Carter P4070 Electric Fuel pump shuts off? [Re: 6T9RR] #2636052
03/23/19 05:50 PM
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Depending on how it's wired maybe the problem. The oil pressure switch may not be able to handle the current the pump requires. This would result in a voltage drop to the pump and potential damage of the motor or the switch contacts. More info needed smile

Re: Carter P4070 Electric Fuel pump shuts off? [Re: TJP] #2636053
03/23/19 05:56 PM
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I was going to suggest bypassing the cutoff switch and see if it still happens.

Re: Carter P4070 Electric Fuel pump shuts off? [Re: mopars4ever] #2636056
03/23/19 06:05 PM
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The oil pressure switch shouldn't be carrying the electrical load because I have the pump wired through a relay. At least that is what I thought the relay is for, to carry the load once it is switch on, the oil pressure switch will turn the relay off if oil pressure is dropped off below 5 - 3 psi. I do appreciate the input thought.

Re: Carter P4070 Electric Fuel pump shuts off? [Re: 6T9RR] #2636057
03/23/19 06:07 PM
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My thought was more on the line of a defective switch.

Re: Carter P4070 Electric Fuel pump shuts off? [Re: mopars4ever] #2636058
03/23/19 06:14 PM
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might be overheating the pump and tripping a thermal cutout. You really need to get in there with a meter when it's happening and see what's missing.


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Re: Carter P4070 Electric Fuel pump shuts off? [Re: 6T9RR] #2636067
03/23/19 06:37 PM
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Originally Posted by 6T9RR
The oil pressure switch shouldn't be carrying the electrical load because I have the pump wired through a relay. At least that is what I thought the relay is for, to carry the load once it is switch on, the oil pressure switch will turn the relay off if oil pressure is dropped off below 5 - 3 psi. I do appreciate the input thought.


Providing the relay is wired properly, the connections are all good,The relay and wiring are sized properly about the only thing left is a flaky ground. Doubtful you would get two bad pumps in a row but possible.
'
A schematic would help wink

Have you tried a failed pump off the car??? Maybe check the resistance across the terminals?? Next stop might be to call their tech support. beer

Re: Carter P4070 Electric Fuel pump shuts off? [Re: TJP] #2636092
03/23/19 07:27 PM
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I've double checked the wiring itself, all things look good, gauge, connections, grounds, as for the oil safety switch, I'll have to look into checking to see if it is operating correctly. I have read about thermal shut downs on these pumps happening, I'll have to work on wiring up a multi-meter to see if I can detect when it is shutting down, then checking the pump to see if it is hot. Again, I do appreciate all inputs, this has been an issue since I put the first P4070 in last September.

Re: Carter P4070 Electric Fuel pump shuts off? [Re: 6T9RR] #2636177
03/23/19 09:55 PM
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This may have already been covered but I would run 12V right to the pump itself & take it for a spin, if (now) ok this would elim the pump/ground path.


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Re: Carter P4070 Electric Fuel pump shuts off? [Re: RapidRobert] #2636233
03/24/19 12:35 AM
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hi
hi you must have the right psi switch , it will need to be a n o switch . < normaly open > psi will close the contacts to run te pump.

Re: Carter P4070 Electric Fuel pump shuts off? [Re: calrobb2000] #2636265
03/24/19 08:27 AM
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Originally Posted by calrobb2000
hi
hi you must have the right psi switch , it will need to be a n o switch . < normaly open > psi will close the contacts to run te pump.


It runs for a while then shuts down.

The switch isn't magically changing from NO to NC.


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Re: Carter P4070 Electric Fuel pump shuts off? [Re: Supercuda] #2636459
03/24/19 02:23 PM
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Originally Posted by Supercuda
Originally Posted by calrobb2000
hi
hi you must have the right psi switch , it will need to be a n o switch . < normaly open > psi will close the contacts to run te pump.


It runs for a while then shuts down.

The switch isn't magically changing from NO to NC.


However, if the Oil pressure switch is not and on / off type switch, but rather one that varies the resistance to ground via the oil pressure being being produced ( think gauge sending unit), it could cause some issues activating the relay coil keeping in mind the resistance changes as the engine warms up and the pressure drops.

Roberts idea is also not a bad one as it would identify the circuitry or the pump as the culprit

beer keep us posted

Re: Carter P4070 Electric Fuel pump shuts off? [Re: TJP] #2636540
03/24/19 05:09 PM
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Well switch does imply on/off and sender implies variable resistance. So assuming he does have a switch like he stated then that should not be it. But if he had a sending unit instead then yeah that might be an issue but he'd have to have something like a temperature sender that changes as it gets hot. Oil pressure sender would pretty much change immediately once the engine is running.


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Re: Carter P4070 Electric Fuel pump shuts off? [Re: Supercuda] #2636548
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This is part of the difficulty we encounter when trying to help troubleshoot something online. We don't always know exactly what has or hasn't been done on the other end. beer

Re: Carter P4070 Electric Fuel pump shuts off? [Re: TJP] #2636628
03/24/19 08:44 PM
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With more thought I dont think it is the pump/ground but I still think I'd grab a long jumper & get those parts elimed.


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Re: Carter P4070 Electric Fuel pump shuts off? [Re: RapidRobert] #2636739
03/25/19 12:06 AM
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Hi All,
This is what I learned today trying to test the electric fuel pump. I turned the ignition on and let the electric fuel pump run without the engine running for about 20 minutes. I wanted to see if the pump would fail on it's own for no apparent reason or if it would stop if it got to hot. It did neither. It ran the whole 20 minutes, it did get warm and even a bit hot but not so hot that I couldn't put my hand on it. Next I took the car out for a spin around the block/country roads, when the electric fuel pump shut off I pulled over quickly and put my hand on the pump, it was cool to the touch. I turned the car back on, it fired back up, and the electric fuel pump was running fine. I now think it is the oil pressure safety switch as one of you told me before. I need to eliminate it from the circuit and try it again. I'll update this post once I figure out how to do that. Thanks for all the advice, I really appreciate it!

Re: Carter P4070 Electric Fuel pump shuts off? [Re: 6T9RR] #2636953
03/25/19 01:02 PM
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Nice, keep us informed please.


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Re: Carter P4070 Electric Fuel pump shuts off? [Re: aspenrt360] #2643418
04/09/19 08:52 PM
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4/9/2018 Update: I put a meter on the power line from the relay to the fuel pump and when the ignition switch is "on" the power line shows 12 volts and the fuel pump is running. Once I start the motor the power line goes to "0" and the pump shuts down. I have already replaced all the components, the pump, relay, oil pressure safety switch, the wiring has been triple checked. I will now research how to test a holley 12-810 oil pressure safety switch to see if they are in fact bad. Thanks, Paul 6T9RR

Re: Carter P4070 Electric Fuel pump shuts off? [Re: 6T9RR] #2643427
04/09/19 09:14 PM
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Chevy had a three terminal oil pressure safety switch on the vegas. You might want to check that out as it would kill the fuel pump when the oil pressure went away but the minute you got oil pressure it powered the fuel pump.

Re: Carter P4070 Electric Fuel pump shuts off? [Re: stumpy] #2643431
04/09/19 09:21 PM
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Diplomats used a similar switch to power the choke only when the engine was running. Since his FP is on a relay that switch would also work fine for his setup.


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