Q: fuel pressure fluxtuates while runninh

asked by on

I attached my fuel pressure gauge it reads at 60 but shaky when i hit the throtle it straightens out it droped down to 40 a couple times is it my fuel regulator or fuel pump

My car has 140000 miles.

Hello. Your vehicle uses a new design that integrates the pressure regulator into the fuel sender assembly. This eliminates the return plumbing and external regulator, keeping hot liquid fuel out of the tank which reduces the potential for evaporative emissions. Your pressure reading should be 50 PSI minimum. If the pressure drop to 40 PSI is extremely brief, it might be acceptable. If you have never changed the fuel filter, putting a new filter in could mitigate the dip you are seeing. At 140,000 miles if the filter hasn’t been changed you should change it anyway. A restricted or plugged strainer can also cause pressure dips and so can poor connections at harness connectors and a poor ground circuit for the fuel pump. If you were led to the fuel system while trying to diagnose an engine management issue and you still need technical assistance with that issue by all means contact YourMechanic for further help.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. fuel pressure fluxtuates while runninh

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: after sitting for a week fuel gauge not working sitting on E

This is somewhat common on the later model Corvettes. Try unhooking the battery to see if a "global reset" will correct this as sometimes this allows the controllers to reset. The Corvette (as well as many other vehicles) has an...

Q: Q: AC fan not working

The most common causes of the AC fan not working are problems with the temperature sensor or the fan itself. If you need assistance with this, I would recommend having a certified mechanic, such as one from YourMechanic, come to...

Q: 5.7l cuts out when you throttle the engine from a stop. Gets going sometime then hesitates. When it gets to 50 mph it runs fine.

Hi there. Check the IAC (idle air control valve) and see if its functioning. If the engine is having an issue with stumbling, the IAC could be causing the engine to stall out. If the IAC is working properly, then...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...