Jegs Electric Fuel Pump
 

I have a JEGS 555-159068 Universal Marine Electric Fuel Pump 12V [6-8 PSI 72 GPH electric fuel pump on my '73 Ford 302. It runs constantly with power applied. It does not turn off when it reaches a certain pressure. When first turned on, the output pressure is 4 psi which is good for my carb, Edelbrock 1406. Yeah I know the specs say 6-8 psi. The gauge is a $22 Boltigen Fuel Pressure Gauge. After 10 mins of powered on and running without the engine running, the output psi, on the pressure gauge drops to zero. I don't know if this is to be expected as fuel is not flowing through the pump, and it is overheating, or the pump is bad. Any other electric pump I have owned shuts off at a certain pressure if fuel is not flowing through. Maybe I should actually run the engine while the pump is running. I will, but I thought I would ask here first. Thanks

Re: Jegs Electric Fuel Pump
 

Hello Have no answers. If it is rebranded pump sold by Jegs, their tech dept. should have answer to that question. Summit does but make sure you talk to a TECH person, sales people cannot be trusted. I had questions about summit fuel pressure regulator, got some bad advice from sales people. Have a blue holley pump, it never shut off, has a built in relieve valve, but must use a return line from regulator to tank.

Re: Jegs Electric Fuel Pump
 

Thanks for the advice. I ran the boat for at least 10 minutes. Pump pressure stayed around 3 psi. Pump warmed up to the touch but not near as much as running with the engine off. I don't like the fact the specs say 6-8 psi, and I am reading around 3. The JEGS Tech person is a good start.

Re: Jegs Electric Fuel Pump
 

https://www.fordbarn.com/forum/attac...p;d=1772892947

JEGS 555-159068 Universal Marine Electric Fuel Pump

Re: Jegs Electric Fuel Pump
 

I'm sure if you ran the pump with no fuel movement for ten minutes you boiled what fuel was in the pump out . If this is a carter style pump it has a pressure relief valve which can be removed and cleaned

Re: Jegs Electric Fuel Pump
 

Thanks for the help. I called JEGS Tech Support. The man said the pump should not be run for any length of time without the engine running. That is logical but I don't recall reading that in any literature that came with the pump. Anyhow, he pointed me to a JEGS 4 psi pump for $95. I am going to accept that I have damaged the pump and should replace it.

Re: Jegs Electric Fuel Pump
 

Most after market electric fuel pumps do not shut off during operation. The exceptions are some low pressure soleniod or electronic designs. Your JEGs looks like a Carter rotary vane design I am familiar with and runs continuous with the ignition on.


They are, however, not designed to run for extended lengths without fuel flow. I always install a switch to prevent the pump from running when performing engine work not needing fuel.


You need fuel flow (engine running) to create proper gauge pressure, but your fluid filled gauge may be the issue. I found many years ago that draining the fluid allows the gauge to function normally. I've never understood the reason for fluid filled fuel gauges, and have proven they are not needed more than once, at least when vehicle mounted and not on the engine.