Thump

Well, this little whatchamacallit thingy is leaking. It's not the little washers at the top, it's on the bottom, there's a small countersunk hole and it's leaking from there. I don't know what it is, I know I cleaned the injectors but never touched this thing. I know it's dripping so bad that while under power I'm not really getting 10-12 like I thought, the looks of it closer to 16-18mpg lol.

'86 22R-E front of rail beneath the TB. I'd do a search but have no clue what this parts called.

chrisorbics

Hi, wow I don't know what it is either. Hopefully someone else can figure out what this part is called and then we should be able to get a better idea of what and why it is leaking. The only fuel leaks I have ever had was on my 1994 pickup and 1986 pickup. Both were fuel pump brackets due to rust.

Check out my 1986 pickup when you get a chance. I just did a lot of frame work.

SPARKS89

iTrader: (1)

What engine do you have and where on the engine is that located?

Thump

Thought I posted that lol. It's a '86 22R-E, front of the engine under the TB. The blurr at the top of the pic is the TB.

arlindsay1992

iTrader: (8)

Can you post a picture of where the leak is coming from?

Thump

Can't, but where my fingers pointing, it's on that part on the bottom. Best I can do.

arlindsay1992

iTrader: (8)

There is no picture.

Thump

It screws on so I'll go pull that dude off and snap a better pic. I'm a carb guy, this new stuff, EGR valves and ports, Maf, ECM, all that crap is tough lol.

arlindsay1992

iTrader: (8)

Well as soon as the page refreshed you picture loaded. It wasn't there the last two times I posted. Anyway, I had the exact same problem on my 87 Runner. The part is called a fuel pulsation damper or something like that. I got a new one from Rock Auto for about $75 after shipping.

arlindsay1992

iTrader: (8)

Go to http://www.rockauto.com/, at the top click "Part Number Search", then type in "FPD7" into the seach bar. That's the part you need.

You can also find it through the parts tree under Toyota/1987/4Runner/2.4 L4/Fuel Air/Fuel Injection Pressure Damper.

arlindsay1992

iTrader: (8)

I got mine in a couple days. It just takes a crecent wrench to remove and replace. It doesn't come with new copper washers but I reused mine without issue. Easy fix.

arlindsay1992

iTrader: (8)

Here's my shiny new one. Been problem free since I installed it about two months ago.

Thump

Thanks a bunch! Pressure valve lol. Yes that dudes not cheap! On a good note I had a fuel pump go bad, made a few calls, talked to PO, found out his buddy bought a new one for him. In like 15mins his buddy calls me, took a few days to settle things with the parts house and BAM, new fuel pump and screen for free under warranty. That saved me $150, which half goes to this thingy lol. It's all good, I'm about to pull a rear chunk for a swap to a locker from a welded carrier and then I'll get this part. $75 is good, Oreillys shows to be $82 before taxes, which isn't bad but I may go the online route since I'm in no real hurry. How's a warranty carried through your new pressure valve? Local parts stores are nice because of their warranty and how close they can be.

arlindsay1992

iTrader: (8)

I have no idea about warranty. I doubt there's any. I guess I just hope it doesn't break again. If it does I might buy a Toyota one since the first one lasted 319,000 miles. But it's probably expensive.

Walt

The Toyota Pulsation Damper is $144.45 plus Washers and tax. Mine is also leaking, found 'rockauto.com' to be about $72.00. I have an old 1990 Toyota v6 3.slow sitting out back and the Pulsation Damper from that will fit my 1988 22RE. The only problem is I have to remove the whole throttle body to get to it. Some 22RE's came from the factory without the damper, so I wonder just how bad it is needed. It's a 14mmX1.5 bolt that the damper attaches to, I'm thinking about just getting a 14mm bolt and putting it in the lathe and cutting a new hole so it fits and doing away with the damper.

Any it sounds like you have yours fixed - - Good luck..

Walt Lindsay
Northern Nevada

Thump

Mines not fixed. Im doing a rear locker so I havent got to the damper. I have it off and plugged the hole so Ill see what it does and how it acts. Its saving a ton of cash and a few people have said some engines didnt have the dampers. It may be a way to just get money out of people lol.

Thump

Negative Ghostrider! It wont run long plugged or Ive acruired a much bigger problem overnight.

rpij137g

I have a 1985 Toyota Pickup, Standard Cab, 4X4, 22RE, (factory cruise, moon roof, SR5, the works). I bought the truck from a guy in North Carolina ~4 months ago because all the trucks in Albany, NY are rusted.

I'm posting to this thread because I had an issue with my fuel pressure damper yesterday. Here's my story:

My gril friend and I were driving down to New Jersey but stopped on the way ~ 45 minutes out to see a historic site. As we pulled into the tool booth i smelled this strong gasoline odor. I attributed it to the rusted out junker in front of me. We pulled into the parking lot of the historic site and I checked the engine bay. Sure enough, I see a slow drip/drip/drip right where the fuel pressure damper is.

I've had 3 later model 22RE's that do not have this damper part. There has always just been the 19mm bango bolt. My fuel pressure regulator has a plastic cover over it. The gas was dripping from around this cover. I thought the part must be shot. So we gave up on Jersey and tried to get home so I could tear into.

About 15 minutes on the highway and the truck lost power. It lost power and died within 200 feet of the Baltimore Service station on the Northway. I get out and check out the engine bay. Sure enough, there's a TON of fuel everywhere. I snap off the plastic cover for the damper, and guess what's sitting in the cover? A screw with a small o-ring!!! This screw is very small (3/8 inch long, 1/32 inch diameter, phillips head, perfect threads). The o-ring was in great shape; no cracks, flexible.

I'm thinking I can screw that back in and be back on the road. I have no screw driver and am not too confident that's the only issue here. I call AAA and they send a tow truck. Mean while, TWO good smaritans, and a state trooper stop and ask if I need help. I tell them I need a screw driver! No one has one. The AAA tow truck shows up and I tell the guy I need a phillips screw driver before i'm towed home.

I screw the screw back into the fuel pressure damper, start the truck, NO LEAKS. I don't truck it, so I follow the tow truck an exit up the north way and check again. NO LEAKS.

We get back on the highway and head to New Jersey...got our stuff from Ikea, drove home. No problem....

So what happened? What I think is that the screw somehow loosened up over time due to the vibrations in the engine. It loosened just enough to start leaking on the way down. Once it started, it loosened more and more and finally fell out, right before the service station. An interesting note; I filled up the tank because I track my gas mileage. Based on the mileage right after this issue to previous numbers (~20-22 mpg), I leaked three gallons of fuel onto the Northway.

Any thoughts from people on this theory or any information on what the fuel pressure damper does? The purpose of this part is unknown to me but it seems it should be checked periodically to ensure that screw is right.

Thanks for reading and hopefully you're trucks are holding up.

scope103

When the injectors open (they all open at once), the fuel pump can't quite keep up from all the way in the back, so the pressure in the rail drops. Since the fuel delivery depends on a constant pressure drop over the injectors, that pulsation in fuel pressure causes errors in fuel delivery. The Fuel pressure damper is like a fluid shock absorber and "damps" the pressure variation.

And yet, I'm told that later model 22REs don't have the FPD. Later model 3ZVEs do. Can you just take it out? Who knows? It is certainly possible there is a difference in the ECM programming between the two versions, so the injector open-time is slightly different.

Incidentally, the purpose of that screw is so you can quickly tell if there is pressure in the rail. With no pressure it should be flush, and w/pressure it sticks out slightly. I'm sure it was intended to be a non-service item, but others have reported losing that screw, with the same result.

aquaprice

Swapped mine out from my 87 runner to one from a 93 pu without the Pulsation Damper. No change in the fuel mileage or performance. Put 45k miles on with no issues.