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  #1  
Old 06-27-2017, 02:09 PM
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72jeeperjoe 72jeeperjoe is offline
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Electric fuel pump pressure

I am installing an electric fuel pump, carter p4070. It runs 4-7 pds from what I have seen. I am running a carter bbd carb on my 258. In your guys experience should I run a regulator to run it at 3-5 pds or not worry about it. I usually run regulators however those are on purpose built drag race motors, not stockers. Thanks!
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  #2  
Old 06-27-2017, 02:23 PM
joe joe is offline
 
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4-7lbs for a carbed motor is fine. No need for a regulator.
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  #3  
Old 06-27-2017, 03:32 PM
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72jeeperjoe 72jeeperjoe is offline
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Thanks. That is what I figured just checking to see other people's experience with this pump. My other 3 engines I built I use regulators on due to the pump I use (Holley red pump). The first time I built my 393 striker for my Thunderbird the pump spiked and blew out the seals on my carburetor (Holley dominator) so I have always been careful. Thanks again.
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1983 Jeep Wagoneer-322,000 miles.
1972 Jeep Wagoneer-360-auto-sold
1988 Jeep Grand Wagoneer-One owner-64,000 original miles-Sold unfortunately
1968 Jeep Gladiator, full Resto in progress
1963 two door ifs one owner Wagoneer
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  #4  
Old 06-28-2017, 08:26 AM
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Probesport Probesport is offline
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While not always necessary, a regulator is cheap insurance and allows for a bit more fine tuning.
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  #5  
Old 06-28-2017, 02:40 PM
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72jeeperjoe 72jeeperjoe is offline
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That is what I am thinking, due to previous experiences I am going to run one.
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1983 Jeep Wagoneer-322,000 miles.
1972 Jeep Wagoneer-360-auto-sold
1988 Jeep Grand Wagoneer-One owner-64,000 original miles-Sold unfortunately
1968 Jeep Gladiator, full Resto in progress
1963 two door ifs one owner Wagoneer
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  #6  
Old 06-28-2017, 04:58 PM
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Mikel Mikel is offline
 
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4-7PSI is fine. Lowering the pressure might cause fuel supply issues and vapor lock problems on hot days.
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  #7  
Old 06-29-2017, 01:07 AM
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Regulators are mostly used when you have a high pressure pump inside or very close to the tank. It pumps the fuel up to 50 PSI or so and the regulator at the inlet of the carburetor drops it back down to 5 PSI or so. A high pressure pump with regulator is more effective at stopping vapor lock than a low pressure pump.

Or you just have the factory return line on the fuel filter. Those are very effective at preventing vapor lock.
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  #8  
Old 06-29-2017, 11:48 AM
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72jeeperjoe 72jeeperjoe is offline
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I may run a high pressure pump then with a regulator, I do not have a return line, it was removed at some point in the past. I will be adding a return line when I do the pump however because I will being doing fuel injection at some point. I don't have issues with vapor lock on my other engine builds and I would like to keep it that way haha!
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1983 Jeep Wagoneer-322,000 miles.
1972 Jeep Wagoneer-360-auto-sold
1988 Jeep Grand Wagoneer-One owner-64,000 original miles-Sold unfortunately
1968 Jeep Gladiator, full Resto in progress
1963 two door ifs one owner Wagoneer
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  #9  
Old 05-04-2020, 10:26 AM
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waggin_around waggin_around is offline
230 Tornado
 
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I installed a carter electric fuel pump after continued issues with replacing mechanical fuel pump on my 1980 waggy. Also installed in line fuel gauge. So I didn't cut down the fuel metal line or install near the tank, but actually installed it next to radiator on front wheel well. That fixed the starting/running problem. But now it has a hard time restarting after running and i have to unplug the fuel pump then it starts, then plug the wire back on.. Should I get a regulator to keep the pressure to carb lower?

I also didn't yet install the oil pressure switch to the pump so its running off a relay from the keyed ignition switch. Maybe its too much fuel when cranking it to start..
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  #10  
Old 05-05-2020, 08:01 PM
redwoody redwoody is offline
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revolution electronics has a module that gives a 3 sec prime plus reads off ur tach signal to stop fuel pump
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  #11  
Old 05-08-2020, 10:45 AM
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letank letank is offline
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I have been running the P4070 on the 74 for over 10 years, no return line, no problems, IIRC the 258 has a different fuel pressure requirement a bit lower 4 to 6 psi than the 360 5 to 7 on the OE carb, but it is close enough
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Last edited by letank : 05-08-2020 at 10:54 AM.
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  #12  
Old 05-13-2020, 02:51 PM
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waggin_around waggin_around is offline
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Quote:
Originally Posted by redwoody
revolution electronics has a module that gives a 3 sec prime plus reads off ur tach signal to stop fuel pump

thanks for this tip.. is that easier to install than the oil pressure switch? I just read the install manual and I don't know where the TACH lead is on a 1980 waggy...

Last edited by waggin_around : 05-13-2020 at 02:56 PM.
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  #13  
Old 07-12-2020, 09:08 PM
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waggin_around waggin_around is offline
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So went to start after sitting for a week and it started with throttle but wouldn’t idle. Finally let off the gas pedal and it quit and heard lots of liquid flowing onto garage floor. It was gas! Coming from what looks like bottom of vapor canister (part previously didn’t know about). Thinking maybe too much pressure from electric pump blew something in vapor canister? What should I do to get it fixed? Delete the canister or get aftermarket?
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  #14  
Old 07-14-2020, 04:53 AM
bagusjeep bagusjeep is offline
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Vapour can is not directly connected to the fuel pipes. It is however connected to the top of the tank and various other bits to eventually suck up vapours into the running engine rather than allow them into the atmosphere.

It is easy to connect to the wrong lines sometimes.

ARe you sure you have not connected a return line to the vapor can?
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  #15  
Old 07-14-2020, 08:40 AM
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[quote=waggin_around]So went to start after sitting for a week and it started with throttle but wouldn


Looks like a single quote can be problematic.

Quote:
Originally Posted by waggin_around
So went to start after sitting for a week and it started with throttle but wouldnt idle. Finally let off the gas pedal and it quit and heard lots of liquid flowing onto garage floor. It was gas! Coming from what looks like bottom of vapor canister (part previously didn’t know about). Thinking maybe too much pressure from electric pump blew something in vapor canister? What should I do to get it fixed? Delete the canister or get aftermarket?
Year/model/equipment of this Jeep? These Jeeps were built for more than 30 years; it matters. You can put that in your signature file and it will appear with every post.

The vapor recovery system also recovers the float bowl vapors. Seems likely that the float stuck and the bowl overflowed into the charcoal canister. A stuck-open float will be more likely with higher fuel pressure.
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  #16  
Old 07-14-2020, 07:07 PM
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waggin_around waggin_around is offline
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Thanks guys yeah it
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