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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 11-28-2006, 12:33 AM   #1
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Leaking fuel pressure regulator

I think I've finally found the cause of my recently-atrocious gas mileage. When the truck is running and for a short time after I shut it off, I can see fuel dripping about twice per second off of what appears to be the fuel pressure regulator. I haven't taken things off to see if that is indeed what's leaking, but if it is the FPR, how hard is it to replace? Or is it just an O-ring seal inside that might be leaking?

Knew there had to be a reason why my truck smells of gasoline after it sits for a few minutes.
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Truck - 1986 4Runner SR5 - 22RE 5spd - lifted, locked, geared - armor 60%
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Old 11-28-2006, 04:17 AM   #2
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Disconnect the return hose, vacuum line and unscrew it. I might have undone the EGR tube for access.
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Old 11-30-2006, 10:48 PM   #3
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Is it the pressure regulator or the pulsation damper? Fuel pressure regulator is near the firewall, pulsation damper is near the front, under the intake manifold. Both are known to leak with age.
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Old 12-01-2006, 12:45 AM   #4
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I was wondering if this truck had a fuel pulse dampener, as my Mustang does. It is indeed the one in front, so I guess that's it. Is it the actual dampener that goes bad or just the O-ring or seal that seals it?

I think I'm getting about 8 mpg lately with this fuel drip.
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Truck - 1986 4Runner SR5 - 22RE 5spd - lifted, locked, geared - armor 60%
Car - 1995 Lexus SC400, black interior, high miles, coilovers, exhaust
Pickup - 1985 Toyota Xtra cab pickup - 2wd, 22R, 5spd, 270K miles - farm truck

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Old 12-01-2006, 03:08 PM   #5
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I know that the screw in the middle sometimes backs out to the point where it falls out and begins dripping fuel through the hole.

They're not repairable so you'll need to get a new one. I believe they're a dealer item only.
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Old 12-01-2006, 03:42 PM   #6
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There is an o-ring.
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Old 12-01-2006, 03:42 PM
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22r, 30, 86, dampener, damper, fuel, grand, leaking, pressure, pulsation, pulse, regulator, regulators, tbi, toyota

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