☰
GET A QUOTE

Q: Turn ignition on fuel pressure goes to 60 lbs two seconds and fuel pump relay clicks pressure drops 5 lbs then slowly drops to 0to

asked by on June 01, 2016

I replaced fuel pump and fuel pressure regulator and cleaned injectors still no start condition no fuel delivery when do fuel pressure test it drops exactly 5 lbs then gradually drops AL the way down when the pump relay clicks two seconds after ignition turned to on position

My car has 165 miles.
My car has an automatic transmission.

Recommended Services

Car is not starting Inspection $94.99 - $114.99 Get a Quote
Or For Any Other Auto Repairs Get a Quote

It sounds like this fault may have more going on than just the fuel delivery issue. The vehicles ECU will command the fuel pump to turn on normally when a vehicle is started. If the car only primes for the second when the key is turned, then for some reason the ECU may be pulling the fuel.

This can happen due to a failure with various sensors or ignition component, such as the oil sender, ignition switch, ECT sensor, or various other failed sensors. If the car has codes stored in the ECU it may lead to more information as to what is going on. A qualified technician will be able to diagnose this fault no start fault and perform any repairs required.

GMC
1999
V8-5.7L
C3500
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

What does it mean if the Battery Light comes on in the dash?
Your car’s dash is “information central” for everything you need to know about the vehicle. If you see the Battery Light (https://www.yourmechanic.com/services/battery-light-is-on-inspection) turn on (also called the Charging System light), it means that the battery is not being charged. This...
Read more
What is the maximum vehicle capacity weight?
The maximum vehicle capacity weight is located on the Tire and Loading Information label. The Tire and Loading Information label is attached to the vehicle center pillar. You can find the Tire and Loading Information label by opening the driver...
Read more
Axle or CV boot needs replacing
Hi there. Anytime one of the boots tears and begins to leak grease, the boot, at the very least, will need to be replaced. When an axle goes out out, there will either be a noise, or vibration associated when...
Read more
Starts only when moving flywheel
Hello there, there are a few potential reasons for why your car will only start when the flywheel is turned. The most common would be the crankshaft position sensor (https://www.yourmechanic.com/services/crankshaft-position-sensor-replacement), weak or binding starter (https://www.yourmechanic.com/services/starter-replacement), or a faulty cam sensor...
Read more
Why does my car lose power at 20 miles an hour and 60 miles an hour and my check engine light goes on and off
Hello. It sounds like you may have a sensor issue going on with your car. Most of the time when something like this occurs it is caused by a throttle position sensor that is not working properly. It can also...
Read more
Heater is not working
The lack of heat being generated by your system may indicate a clogged heater core. The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this...
Read more
Car is loosing coolant
Your car is obviously loosing coolant. It could be a leak in a hose or water pump or something like that, or it could be going into the engine through a head gasket. either way you need to get it...
Read more
When i start my car, my car will begin to shake, which goes away after a minute or by me turning the car off and starting again
The problem sounds like the engine may be misfiring in the ignition system or the computer has a problem with one of its sensors like the camshaft or crankshaft sensors. The best way to narrow down the cause of the...
Read more

Related articles

A Buyer’s Guide to the 2012 GMC Sierra Hybrid
When When you buy a truck – even a half-ton truck like a GMC Sierra 1500 – you expect to make a trade-off between hauling capacity and fuel efficiency, right? Well, the designers and engineers at GMC don’t think that...
Read more
A Buyer’s Guide to the 2012 GMC Acadia
When When it comes to finding the right SUV for your family, it seems like there are always a lot of compromises to be made. One vehicle is so performance and off-road oriented that you can’t imagine taking your kids...
Read more
A Buyer's Guide to the 2012 GMC Yukon XL
When When you want a huge vehicle with plenty of luxury inside, you’re probably going to be happiest with the 2012 GMC Yukon XL. Key Features The 5.3-liter V8 engine on this full-size SUV isn’t surprising, but its fuel economy...
Read more

Browse other content

Services
Maintenance
Cars
Cities