Good diagnosis, I’m about to perform this test with my 93 del sol I purchased not long ago it all the sudden won’t start after cranking, I already know relay is good I even bought a new one just to test that and it still didn’t work so now I’m suspecting the wiring or the fuel pump is actually bad, cuz I don’t hear the buzzing humming anymore everytime I turn the key to “on” position I hope to get a good result after this test and will check back after
Hey Vincent, If you're able to read my post, perhaps what you know just might help with a problem I'm having, if you're inclined to respond. I have the same model as your car (91 CRX Si - 187k miles). Back this past mid-February I could not start the car, so I installed a new OEM Main Relay. That didn't solve the problem. I followed the Honda CRX service manual steps to test the main relay harness & fuel pump, and the result was that the fuel pump needs to be replaced. I followed the steps you explained in your video, and was able to verify that battery voltage was going to the fuel pump. However, the thing that stumped me is that when I turn the ignition key to the ON position, the secondary noise (i .e. fuel pump engaging, being primed) does not register. Not a sound. It's apparently a completely dead fuel pump (much like a light bulb having gone out). Have you ever heard of a fuel pump cutting out like that? And then when electric current is fed to it, there's no response whatsoever. I kida had the assumption that fuel pumps go bad in stages, like your car's situation. Not just die completely. One possible factor I can think of why the fuel pump crapped out is because I hardly drove the car for over a decade. Kept it in the garage, started the car and ran the engine for 30 minutes once a month. So the gas in the tank is really old, which has 10 to 15% ethanol. Wondering if the old gasoline in the tank could have prematurely killed the fuel pump. A bummer I didn't drive the car more regularly. What are your thoughts on a fuel pump crapping out like a burnt light bulb? A rarety maybe? And BTW, did you get the fuel pump replaced for your car? If so, what was the misery index to removing the gas tank? An all day grunt work? Also, what particular fuel pump brand did you put in? The particulars would really help. Appreciate your patience for reading my lengthy post. I hope to hear from you. Thanks! E. Lee
10v is not enough, but I suspect you may have poor test lead connections. But the right way to do this… You should measure voltage drop between the battery and pump on pos and neg, running of course.
Good diagnosis, I’m about to perform this test with my 93 del sol I purchased not long ago it all the sudden won’t start after cranking, I already know relay is good I even bought a new one just to test that and it still didn’t work so now I’m suspecting the wiring or the fuel pump is actually bad, cuz I don’t hear the buzzing humming anymore everytime I turn the key to “on” position I hope to get a good result after this test and will check back after
Hey Vincent,
If you're able to read my post, perhaps what you know just might help with a problem I'm having, if you're inclined to respond. I have the same model as your car (91 CRX Si - 187k miles).
Back this past mid-February I could not start the car, so I installed a new OEM Main Relay. That didn't solve the problem.
I followed the Honda CRX service manual steps to test the main relay harness & fuel pump, and the result was that the fuel pump needs to be replaced.
I followed the steps you explained in your video, and was able to verify that battery voltage was going to the fuel pump. However, the thing that stumped me is that when I turn the ignition key to the ON position, the secondary noise (i .e. fuel pump engaging, being primed) does not register. Not a sound. It's apparently a completely dead fuel pump (much like a light bulb having gone out).
Have you ever heard of a fuel pump cutting out like that? And then when electric current is fed to it, there's no response whatsoever. I kida had the assumption that fuel pumps go bad in stages, like your car's situation. Not just die completely.
One possible factor I can think of why the fuel pump crapped out is because I hardly drove the car for over a decade. Kept it in the garage, started the car and ran the engine for 30 minutes once a month. So the gas in the tank is really old, which has 10 to 15% ethanol. Wondering if the old gasoline in the tank could have prematurely killed the fuel pump. A bummer I didn't drive the car more regularly.
What are your thoughts on a fuel pump crapping out like a burnt light bulb? A rarety maybe? And BTW, did you get the fuel pump replaced for your car? If so, what was the misery index to removing the gas tank? An all day grunt work? Also, what particular fuel pump brand did you put in? The particulars would really help.
Appreciate your patience for reading my lengthy post. I hope to hear from you. Thanks!
E. Lee
10v is not enough, but I suspect you may have poor test lead connections. But the right way to do this… You should measure voltage drop between the battery and pump on pos and neg, running of course.
If you aren't getting any voltage, then you need to check your main relay. If there is no power from that relay, then the pump also won't work.
I have an 91 si have power to the relay but not getting power to the fuel pump
@@russovangchang1267same problem with mine did you fix this ?
If the voltage from the test is low after texting on the correct ground wire, what would you recommend to fix that?
Hey did you ever figure it out?
@@Urbanstrangler no I sadly did not
Some people run a second relay, with the main relay switching a second relay just for the fuel pump with a 10ga wire run to the battery.