HOW TO DIAGNOSE FUEL PUMP PROBLEMS FROM DIAGRAM VALUABLE TUTORIAL PART 1 

outstanding thank you what if there is no relay in the fuse box for the fuel pump

Wow, very well taught and explained.

This video is very clear and informative. An easier way to check a relay is to make sure its coil is energized and then putting the meter across its contacts and measuring the voltage. If there is 12 volts, that means the contacts have a problem and the relay has not switched. If we measure 0 volts, that could mean two things. 1) The relay is working perfectly. 2) The load is not getting the ground. This is my first appraoch when I test relays in live circuits. The key point is that a closed swich will have 0 volts across its contacts.

Joe you did a very nice work. You fully expounded the schematics.

شرح كان اكثر من رائع انا لا اتحدث بإنجليزية لكن طريقة شرح مخطط فهمت كثير شكرا جزيلا

Good explain for this single line diagram and thank you for this videos and thanks again

Hi, thanks again for your advice and knowledge, you are a very good teacher and I hope your Chanel keeps on going up as it clearly has been.

I don't think u will have 12v too pump if you don't depress the brake peddle, and also press the start switch, like in the start mode???

Hi, I have 99 ford f450 6.8 v10 and I have low fuel pressure. I change, fuel regulator, fuel pump, MAF sensor, fuel filter and intake air temp sensor. I think my two speed fuel pump relay is having issue. I checked the fuel pump harness plug with a multimeter and it showed 6volts on the power end. Im wondering will the relay cause low fuel pressure?

Thanks joe for your great video.. but i want to know what is responsible for activation of the relay in the first few seconds then it is deactivated till i continue switching on the car motor ? Is there timer circuit or something like that ?

Hi Joe, question, can a short input affect and output signal, for a clicking sensor front of the engine, ex IAC and Purge valve? Thx

Joe my 1990 Dodge d150 has a grey wire and a blk on pin 87a. All new relays don't have 87a what is the function of these two wires.

Good teaching where is part 2?

Hi where is the link to your other channel

Where is the brake peddle switch in your diagram that has to be depressed to start the full pump???

Sir can I ask a question? I'ved watched a video spool valve, a valve for water, their is also a coil, when its energize the spool valve will be push away...now I ask the uploader of that video.How does a spool valve being push away when the coil is being energized? When the current pass to wire it creates electromagnetism,so therefore it will pull the valve instead of pushing?Then he replied,(their is a right-hand law it will create a force that pushes a spool to opposite side instead of pulling..)I tell him..(you mean the initial energy from the magnetic flux on the coil as a current flow through causes to push the spool valve?) He replied yes! Exactly!...Now sir,if that energy is present when the coil inside a relay is being energize creating electro magnetic force,then how can the switch contact be magnetized to close from 87a to 87 switch contact of relay?

Your diagram only shows 2 wired going to the fuel pump. There are 6 wires going to plug on top of the plug!!! Where are the 4 othere wires??

Just meter your relay and meter your relay receptacle to make sure you have constant power to the relay, that back tests the computer. Your making this way to complicated.

U are pointing at a diagram with that???? What is That!!!!!!! U Know! Should I????????