Fuel Pump Relay

[dsulu]

Hi, folks,

I am looking some instruction to troubleshoot Fuel Pump Relay, I was wondering if anyone can point me in a right direction. ( I did search the forum for a while )

Also, How do you “jump” 87 and 30 fuse?

Would a defective relay throw a code?

Any help is greatly appreciated.

1998 2.5 litre, 5-speed.

Problem: still troubleshooting engine stalling (fuel cut-off?) problem when the engine warms up ~180 degree.

Code: no code displayed using Durametric

[Hilux2400]

If you suspect a relay why not just change it. Often relays are generic items and similar relays (just a switch that allows high power transmission) can be sourced from Hella or Bosch. Printed on the relay housing is a rating value and a line diagram of its function.

Jumping fuses can be dangerous stuff and can cause fires. The fuse has a function. When power consumption in that track is too high it blows to prevent overheating and damage. It's much better to check continuity of circuits with a meter before you start jumping fuses.

Take care

H

[JFP in PA]

Hi, folks,

I am looking some instruction to troubleshoot Fuel Pump Relay, I was wondering if anyone can point me in a right direction. ( I did search the forum for a while )

Also, How do you “jump” 87 and 30 fuse?

Would a defective relay throw a code?

Any help is greatly appreciated.

1998 2.5 litre, 5-speed.

Problem: still troubleshooting engine stalling (fuel cut-off?) problem when the engine warms up ~180 degree.

Code: no code displayed using Durametric

This is how the jumper works:

But before we even go there, have you connected a fuel pressure test gauge to the test port on the injector fuel rail to test the car for both pressure and fuel delivery rate? If the fuel system is shutting down, you would see the sudden loss of pressure when this occurs. Another item to consider is the crank position sensor, which turns off the fuel pump when it fails to see the engine turning, and which also has a tendency to only do this when the engine is warm.

[dsulu]

Folks, thank you for the quick replies and helpful information.

Also, thank you for the clarification on “jump” 87 and 30, they are not fuse numbers but rather the connector number on a board. Is this is located right under the steering wheel?

I will also need to perform a fuel pressure test, is there any write up with photos in the forum, I did look for it for a while.

JFP, you mentioned in one of your replies that there is a Schrader valve on the fuel rail, is it on both fuel rail or just one side? (any photo avail?)

I just replace CPS this weekend. Initially hard to find, once found, the installation is straight forward. I did check the Ohm (resistance) on the old CPS and it is within the spec. therefore that is not the problem.

I have replaced and cleaned a number of things in the past 2 years, TB, idle control valve, fuel filter, fuel pump, AOS, J-tube, breather tube and I even bought Durametric tool for troubleshooting and I am still living with this problem. I am now starting to wonder if the fuel pump is defective even though I replaced it about 2 years ago and I noticed that is when this engine stalling problems started occurring a few months after that.

I also noticed during test drive, on the 3rd and 4th gear, the car feels weak like not enough fuel is getting to engine. Is there a way to test fuel pump ( voltage, resistance etc ) in addition to fuel pressure test?

As always, thank you all for your help.

[JFP in PA]

Folks, thank you for the quick replies and helpful information.

Also, thank you for the clarification on “jump” 87 and 30, they are not fuse numbers but rather the connector number on a board. Is this is located right under the steering wheel?

I will also need to perform a fuel pressure test, is there any write up with photos in the forum, I did look for it for a while.

JFP, you mentioned in one of your replies that there is a Schrader valve on the fuel rail, is it on both fuel rail or just one side? (any photo avail?)

I just replace CPS this weekend. Initially hard to find, once found, the installation is straight forward. I did check the Ohm (resistance) on the old CPS and it is within the spec. therefore that is not the problem.

I have replaced and cleaned a number of things in the past 2 years, TB, idle control valve, fuel filter, fuel pump, AOS, J-tube, breather tube and I even bought Durametric tool for troubleshooting and I am still living with this problem. I am now starting to wonder if the fuel pump is defective even though I replaced it about 2 years ago and I noticed that is when this engine stalling problems started occurring a few months after that.

I also noticed during test drive, on the 3rd and 4th gear, the car feels weak like not enough fuel is getting to engine. Is there a way to test fuel pump ( voltage, resistance etc ) in addition to fuel pressure test?

As always, thank you all for your help.

Passenger's side fuel rail (item #7):

Pressures:

Engine off 3.8 +/- 0.2 bar

Engine idling 3.3 +/- 0.2 bar

[Jacob Hernandez]

Hello, did you ever solve this issue? I have the exact same issue with my 02 boxster and can't figure it out. Aos, maf, throttle body, vacuum lines have been swapped. Car dies at operating temp when coming to stops