2017 Tacoma FPR

yeowguy

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Make
Toyota
Model
Tacoma
Year
2017
Miles
88k
Engine
2.4L
I have a 2017 2.4L Tacoma SR 4x4 5 speed. The fuel pressure with a Tee connection to the gauge reads 50psi at idle and reving. From google searches I believe this is supposed to be 41psi. Does anyone have the spec to confirm? The Fuel Pressure Regulator with a vacuum pump does bring the pressure down. But when I disconnect the host from the FPR to the intake it doesn’t change on the pressure gauge. I also done feel a vacuum coming out of the hose to the FPR.
 

billr

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Have you disconnected the FPR-manifold hose at the manifold end; is there no vacuum at that port/nipple on the intake manifold?
 

yeowguy

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There’s no vacuum coming out of the tube from the intake. I also hooked up a vacuum gauge to see and it stayed at 0
 

billr

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Stick a small wire or nail through the port and try to clean it out.
 

yeowguy

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I gave that a shot and seems clear but still no vacuum showing on the gauge
 

billr

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Post a picture of that vacuum port on the manifold.
 

yeowguy

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Ya this has been an ongoing issue where the truck bucks on take off with a cold engine. The idle has a slight stumble on a warm engine and you can feel a bit of a stumble on take off in 1st on a warm engine. No check engine light but feels like a misfire. I’ve replaced the spark plugs. Here are some photos
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99F2CABD-F234-4C0E-B0D6-16861E16A43F.jpeg
 

Mobile Dan

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It seems unlikely that "manifold vacuum" would be available at that spot in the intake ductwork. I wonder why the vacuum hose connects at that spot. I have seen a similar routing on some other vehicles, and it puzzles me. 1637682937289.png1637683438777.png1637683484082.png
 
Last edited:

yeowguy

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Where mine is at the higher side of 50 so you think that’s my issue? It’s only when taking off in first and at times a stumbling idle. I thought it was an issue with the clutch until I noticed the idle. On a cold engine it’s an aggressive bucking in 1st. On a warm engine it’s a slight stumble in 1st at the release point.
 

billr

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It sounds like the FPR is not getting a vacuum signal to respond to. 50 would be OK when the engine is under full load (MAP ~ 100kPa), but pressure should be lower at idle.
 

grcauto

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Where mine is at the higher side of 50 so you think that’s my issue? It’s only when taking off in first and at times a stumbling idle. I thought it was an issue with the clutch until I noticed the idle. On a cold engine it’s an aggressive bucking in 1st. On a warm engine it’s a slight stumble in 1st at the release point.
If the FPR does not go higher under full throttle either the vacuum is missing or the regulator is bad. Put a vacuum on the FPR and see what happens to the pressure.
 

yeowguy

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When I put vacuum on the FPR the pressure drops to to as low as 42psi. No hose connected it stays at 50psi as it is when the hose is connected
 

billr

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Hasn't it already been confirmed that there is no manifold vacuum at that port on the intake duct? You need to remove/open that duct and see how that port connects to the intake manifold; something seems to be broken inside there.
 
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