Skip the auto shop - Our mechanics make house calls

Q: Fuel pressure test leaks

asked by on

My GMC had leaking gaskets, so I replaced them by removing the upper and lower intake manifolds. I had some fuel pressure bleed down, so I replaced the injectors, fuel pressure regulator and fuel rail. Now I have the lower intake manifold bolted in and the new pressure regulator rail and injectors installed. I attached the connectors to the injectors, but I didn't connect the droves of other connectors, because I'm only half done with this job. Before I do any more assembly and fixing, I want to do a fuel pressure test to check for leaks. I will have to do this test without the fuel pump as the manual directs. My fuel pump isn't working right now because so many things are disassembled. Do you know which connectors need to be attached to make this build pressure? I need to check for leaks first.

A: Hello there. It sounds like you have a few ...

Hello there. It sounds like you have a few things going on with your 1996 GMC C2500. While I commend you on wanting to check for leaks in the fuel system, this is a little tougher than you would think. With the vehicle in its half-put-together state, you cannot start the vehicle. The fuel pump is powered when the key is cycled from off to run. The intake manifold contains sensors such as the knock sensors, a MAP sensor, a coolant temperature sensor, and various others. Without the readings from those sensors the car will not activate the fuel pump and allow you to test fuel pressure. If you need help pinpointing the leaks, an expert from YourMechanic can come to your car’s location to have this addressed accordingly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Get a quote

What others are asking

Q: I have a 1979 Chevy 454 big block will it fit in my 1989 chevy

Hi there: In regards to actual fitting issues, it should be good, as long as you use the flywheel that mounted to the original transmission. However, you're most likely going to have issues with fuel system, and electrical systems matching...

Q: To change the fuel sending unit does the fuel tank need to be dropped? 2003 Saturn L300

YES, the tank has to be drained and removed to replace the fuel pump and/or fuel level sensor. I recommend a fuel level sender replacement performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to...

Q: My trunk will not catch and stay closed

The trunk latch is replaced as an assembly with the pull down mechanism to pull down the trunk lid. If the latch will not raise when you open the lid then the entire latch needs replaced.

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...