Pulsation Dampener- if your smelling raw gasoline read this!!!
 

So i started smelling gasoline from my engine bay after drives and a friend of mine had told me about pulsation dampeners going bad and starting fires, i did not know what this peice was but i was not about to let a preventable fire kill my 86. So i did some research and found a pulsation dampener on mazdatrix for $170 after shipping and handling. After ordering this i found out that you could swap with a $20 banjo bolt but whatever im ok with dropping cash on preventative maintence. So i took the whole intake manifold off and when i got to the pulsation dampener i found something very surprising, there is a little screw and washer under the pulsation dampener cap that had fallen off, could that be why its leaking??

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Someone tell me if i am wrong but my advice to you is that you pull your pulsation dampener cap off and chec kto see if the screw and o ring are secure before REMOVING THE WHOLE DAMN INTAKE,

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so i installed the new one and no more gas leak, but now it wont rev past 4, so can someone please tell me why?:scratch: My friend says injectors because he had a similar issue, so thats what im thinking at the moment, please post ideas if you have any. And also, if you are leaking from your pressure regulator it takes 5 minutes and $1 to fix just need new o rings.

Replacing it with a brand new PD will fix it... But the banjo bolt would have been cheaper and much more effective. PD's leak because of that screw slowly backing and/or falling out. That is why yours leaked.

It probably has something to do with your secondary fuel injectors. The secondaries kick on at 3,800 RPMs. Any other near 4k symptoms?

what are the specs on the banjo bolt? where can I buy? I'm pretty sure i need one my car smells like gas especially at idle.

Make sure you have everything (wires and hoses) reconnected properly after reinstalling the intake manifold.

sbrmechanic won't need to worry about the banjo bolt. His brand new PD will outlive the car.

I'm not really sure where to get the banjo bolt. I've never hade to worry about this. Search "banjo bolt" in this section, and you may find a part number or the source of it.

I found a pic of it in this link -> Rotary Resurrection: Fuel Pulsation Dampener Elimination

thanks mang

How's your ECU ground? [The ground on top of the engine] That being bad will kill your 4K+ revs..

even reinstalling the screw will not really fix the issue, technically it shouldn't leak even with no screw on there, the reason they leak is because the diaphragm is starting to tear which means it should be replaced or omitted anyways as it won't be doing it's job properly at that point.

it actually does seem to happen right at 3800 rpm thats why im thinking its secondary injectors, would you recomend getting new ones or just getting them cleaned?

thanks for the help

Banjo bolt size is 12mm x 1.25

If you have a factory service manual or use the FSM links in the FAQ's, you can check the voltage at the fuel injector pins with a multimeter. (Fuel and Emission Control Systems E.G.I. > Section 4A - Pages 31 & 32)

- Pin 3C is the rear primary fuel injector
- Pin 3E is the front primary fuel injector
- Pin 3F is the rear secondary fuel injector
- Pin 3H is the front secondary fuel injector

You can always secure the injectors to the fuel rails, unbolt the fuel rails (Put something under the fuel injectors to catch any fuel that may spew while performing this test.), jumper the fuel check connector near the passenger side strut tower, turn the key to "ON"... Not to "START". You'll be able to hear the fuel pump running. Check to see if there is fuel spewing out of your injectors. If so, your injectors are stuck OPEN. I doubt this is your case, but if you're feeling ambitious... You can always try it. (There is a great example of this in the FSM. Fuel and Emission Control Systems E.G.I. > Section 4A - Page 70.)

You may want to get your injectors serviced. Here is a great company that services fuel injectors: Witch Hunter Fuel Injector Cleaning and Flow Testing Service

I bought a new one even im s5. The one came with the car seems pretty old, with 210k showing on the odo, that 150 bux wouldnt hurt.

s5 version is superior in that it's all metal. Cost is high though.

Until they come out w/ a PD that's free its a waste of money. Grab a banjo bolt from an S4 fuel rail and be done....forever. Use the extra $150+ on something your car no doubt needs.

Just to throw my hat in the ring I have had a banjo bolt on my car since 2005 with no adverse effects. That said if your pd doesn't leak or you just bought a new one go ahead and use it. I have replaced the pd on about 3 cars with a banjo bolt without issues though, to my knowledge they are all still being driven by their respective owners. I'm surprised the pulsation dampened nazis haven't shown up to call all us banjo bolt guys retarded yet.

The PD's are both metal on S4 and S5 cars. Only difference is, the S5 PD is built into the fuel rail. It cannot be removed.


I think it is the fact that there have been no adverse effects.

However the S5 is sealed, so if it fails, you may never know...

:scratch:

^ You'd have to swap the rail out. If a S5 PD fails, I doubt it will be that noticeable. If people replace the S4 PD's with banjo bolts, how could it be much different from a non operational S5 PD?

rotard

Since it started happening after you worked on the engine, I would first check to make sure the injector clips are fastened correctly and the injectors are firing.

The adverse effects are minor, and there has been no evidence that it causes any significant problems on street cars with stock engines. It starts to become more of a factor as the required fuel flow increases and as the engine rpm increases.

sure enough i take a flashlight and point it at the PD and immediately see gas dripping just a few minutes ago when i went to start up my car. could this leaking cause any other damage? mainly overheating i would be curious about. since it is burning on the engine i would assume it is making that area much hotter then its supposed to be? I cant believe I have been driving around like this waiting to explode. haha life on the edge is a risky one for manbeast

If anyone has a spare banjo bolt pm me Im going to the junkyard today if i cant find one maybe someone can send me one? I am going to look in for sale area as well. thanks much

https://mail.google.com/mail/?ui=2&i....1&disp=thd&zw

i pulled banjo bolt out of my power steering rack that i had gotten rid of. just wondering if anybody thinks it would work? it has holes in it im guessing to regulate flow of the ps fluid.

I bought banjo for girls t2 at summit online. It was about $5 and only took a few days to arrive.

http://fc3spro.com/TECH/FAQ/pd.html

^ Do what tuscani did.


Seriously?... It will burn your car to the ground!

DO NOT DRIVE YOUR CAR UNTIL YOU FIX THIS.