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Old 05-30-2020, 05:55 PM #1
MountainBrew MountainBrew is offline
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Need help diagnosing fuel pump issue

Good afternoon all,

I don't want to rehash a worn out topic, but I've been searching the forum for several hours now and haven't come across a solution.

98 4Runner Limited 3.4 300,000mi

Long story short, I've been welding together armor for my new-to-me 4R. It's been up on jacks for the last week or so while I fab the skids and bumpers. Since I got it I've had no starting or running issues at all.

Today I reconnected the battery and tried to start, cranks fine but no start. I noticed no sound at all coming from the fuel pump.

Any thoughts on what might have caused this? I've had absolutely no issues with the fuel pump up to this point so I doubt it is a coincidence that I've done all this work on it

Thanks in advance
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Old 05-30-2020, 07:22 PM #2
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Quote:
Originally Posted by MountainBrew View Post
Good afternoon all,

I don't want to rehash a worn out topic, but I've been searching the forum for several hours now and haven't come across a solution.

98 4Runner Limited 3.4 300,000mi

Long story short, I've been welding together armor for my new-to-me 4R. It's been up on jacks for the last week or so while I fab the skids and bumpers. Since I got it I've had no starting or running issues at all.

Today I reconnected the battery and tried to start, cranks fine but no start. I noticed no sound at all coming from the fuel pump.

Any thoughts on what might have caused this? I've had absolutely no issues with the fuel pump up to this point so I doubt it is a coincidence that I've done all this work on it

Thanks in advance
Fuse, perhaps?
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Old 05-30-2020, 07:40 PM #3
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Fuel pump only pumps when engine is turning. Doesnít pump up at key on like most rigs.

Were you welding on the rig?

Crank position sensor can give a no start and no engine code when it dies.

You could crack a fuel line fitting and see if there is residual pressure after cranking a bit. These rigs donít have a Schader valve.
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Old 05-30-2020, 07:55 PM #4
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Quote:
Originally Posted by Dieselchessy View Post
Fuel pump only pumps when engine is turning. Doesnít pump up at key on like most rigs.

Were you welding on the rig?

Crank position sensor can give a no start and no engine code when it dies.

You could crack a fuel line fitting and see if there is residual pressure after cranking a bit. These rigs donít have a Schader valve.

Well then Iím not sure what the problem is, I read in a bunch of threads that the fuel pump runs at key on before ignition so thatís why I assumed fuel pump issue. If thatís not the case it could be something else.
I was tack welding on the rig


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Old 05-30-2020, 07:56 PM #5
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Quote:
Originally Posted by thennen View Post
Fuse, perhaps?

I checked all the fuses but still need to test the relays


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Old 05-30-2020, 11:30 PM #6
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I checked all the relays, jumped the +b fp, did every test I could find on the forum. Went back to the fuel tank access panel which I had already checked and it turned out the connector had separated in the middle along the horizontal seam. This had been exacerbated by the 1Ē BL I installed a few weeks ago (donít judge, kids at the mall weíre making fun of my stocker) which strained the wiring harness and separated the connector. It wasnít visible at first glance. After fixing it fired right up.

Thanks for the suggestions


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Old 05-31-2020, 12:25 PM #7
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Another one of those small details you never see mentioned. Wire harness issues due to body lift.
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Old 05-31-2020, 02:25 PM #8
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Check the crank position sensor.
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1998 Toyota 4Runner 3.4 4x4 with 340,000 miles.
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1997 Toyota 4Runner 3.4 4x4 with 247k miles-Project car
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