Fuel Pump Relay noise

supradaddy0803 · 06-15-2007, 08:45 PM

What I would say to look at is the relay becuase unless you push the little screw in on top of your fuel pressure regulator and it hisses a little then there is no pressure there and it will not start. Check the realy per the TSRM mine says with the big lump up on the pin side on the right is one and then 2 on the left. Then at the bottom 3 on the right and 4 on the left. In the plastic cover thingy on the bottom there is a big lump in one side and the other is smaller dont have pick kinda hard to show but I hope you get it. There should be continuity between pins 1 and 3 and none between 2 and 4 if these dont check out then the TSRM calls the relay bad. Also if you apply voltage between 1 and 3 there should be continuity between 2 and 4. Another way to check to see what it is is to short terminals Fp and +B on the check connector and see if you feel pressure on the fuel line. Check out that stuff and let me know what you find and I will look a little further into it to help you out.

GremlinMKIII · 06-15-2007, 10:33 PM

forgot to mention that I have a total of 3 fuel pump relays and each of them do it. The original owner had replaced it once, and I did when I first noticed the sound.

also, we did check the continuity and it is just fine.
fuel pressure is okay, it's getting to the fuel rail just fine.

supradaddy0803 · 06-16-2007, 02:10 AM

Ok well that narrows it down a bit ohm out your airflow meter plug when you are looking at it there needs to be continuity between the first 2. After that check your ignition timing and spark plugs. if they are wet then they are not firing. Prolly just timing or a ground off somewhere its them little things that kill you.

GremlinMKIII · 06-16-2007, 06:51 AM

while the sparkplugs may explain it not starting, I still need to figure out the noise from the fuel pump relay :|

I'll have to check the wiring out extensively to check for a grounding issue.

supramacist · 06-17-2007, 12:42 AM

What's up Gremlin???

Glad to see you found someone who could help you.

GremlinMKIII · 06-17-2007, 10:18 PM

I've disconnected the AFM as per suggestion of a guy on another supra forum to check to see if the relay is still buzzing which it is.

I have come across some other developments in my troubles with the engine though...

turns out the alarm that was in the car is still in it and it may have a disabler as well - could be the reason for the car not starting? but when I jump Fp and +B in the diagnostic box, while shutting up the fuel pump relay, it causes something in the interior to beep for a few seconds, it stops, then pop! - the doors unlock.. (manual locks, power locks added via the alarm installation)

also, when not jumping Fp / +B and I apply the power - not only does the fuel pump relay buzz, it activates the Main fuse in the fuse box up front.

so, is it possible for a mucked up alarm to draw unnecessary power which activates the Main fuse, which in turn is mucking with the fuel pump relay?

thanks again.

supradaddy0803 · 06-17-2007, 11:02 PM

Sounds liek a alram issue then but usually they have a starter cut off and they just wont turn over but from all the stuff you describing it sounds like that alarm is crapped out. I would find the alarm control box and diconnect it and then try to start it. They usually put them under the dash so that would be the first place to check.

06-15-2007, 08:45 PM	#1
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	What I would say to look at is the relay becuase unless you push the little screw in on top of your fuel pressure regulator and it hisses a little then there is no pressure there and it will not start. Check the realy per the TSRM mine says with the big lump up on the pin side on the right is one and then 2 on the left. Then at the bottom 3 on the right and 4 on the left. In the plastic cover thingy on the bottom there is a big lump in one side and the other is smaller dont have pick kinda hard to show but I hope you get it. There should be continuity between pins 1 and 3 and none between 2 and 4 if these dont check out then the TSRM calls the relay bad. Also if you apply voltage between 1 and 3 there should be continuity between 2 and 4. Another way to check to see what it is is to short terminals Fp and +B on the check connector and see if you feel pressure on the fuel line. Check out that stuff and let me know what you find and I will look a little further into it to help you out. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

06-16-2007, 02:10 AM	#3
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	Ok well that narrows it down a bit ohm out your airflow meter plug when you are looking at it there needs to be continuity between the first 2. After that check your ignition timing and spark plugs. if they are wet then they are not firing. Prolly just timing or a ground off somewhere its them little things that kill you. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

06-17-2007, 11:02 PM	#7
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	Sounds liek a alram issue then but usually they have a starter cut off and they just wont turn over but from all the stuff you describing it sounds like that alarm is crapped out. I would find the alarm control box and diconnect it and then try to start it. They usually put them under the dash so that would be the first place to check. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

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06-15-2007, 10:33 PM	#2
GremlinMKIII Stock Join Date: Jun 2007 Location: Abbotsford, BC Posts: 9	forgot to mention that I have a total of 3 fuel pump relays and each of them do it. The original owner had replaced it once, and I did when I first noticed the sound. also, we did check the continuity and it is just fine. fuel pressure is okay, it's getting to the fuel rail just fine.

06-16-2007, 06:51 AM	#4
GremlinMKIII Stock Join Date: Jun 2007 Location: Abbotsford, BC Posts: 9	while the sparkplugs may explain it not starting, I still need to figure out the noise from the fuel pump relay :\| I'll have to check the wiring out extensively to check for a grounding issue.

06-17-2007, 12:42 AM	#5
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	What's up Gremlin??? Glad to see you found someone who could help you.

06-17-2007, 10:18 PM	#6
GremlinMKIII Stock Join Date: Jun 2007 Location: Abbotsford, BC Posts: 9	I've disconnected the AFM as per suggestion of a guy on another supra forum to check to see if the relay is still buzzing which it is. I have come across some other developments in my troubles with the engine though... turns out the alarm that was in the car is still in it and it may have a disabler as well - could be the reason for the car not starting? but when I jump Fp and +B in the diagnostic box, while shutting up the fuel pump relay, it causes something in the interior to beep for a few seconds, it stops, then pop! - the doors unlock.. (manual locks, power locks added via the alarm installation) also, when not jumping Fp / +B and I apply the power - not only does the fuel pump relay buzz, it activates the Main fuse in the fuse box up front. so, is it possible for a mucked up alarm to draw unnecessary power which activates the Main fuse, which in turn is mucking with the fuel pump relay? thanks again.