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-   -   What would cause gasoline to leak from front of engine? (https://www.rx7club.com/2nd-generation-specific-1986-1992-17/what-would-cause-gasoline-leak-front-engine-888390/)

slitherz90gxl 02-19-10 07:43 PM

What would cause gasoline to leak from front of engine?
 
I'm almost certain it was just from my coolant res. It fills up with gasoline because of the numerous internal engine problems.
But I was wondering if there was anything towards the front of the engine bay? the puddle didn't look like it was under the engine more under the rad/fan.

Brodie121 02-19-10 07:53 PM

your coolant resevoir fills up with gas ?? also, fpd possibly causing leak

HAILERS 02-19-10 07:56 PM

Mazda gave you a way to find the fuel leak. They made a two socket elect connector with two wires located near the right front strut tower and gave it the name *check connector*. IF the key is put to ON, and the two socket connector is jumpered with a piece of wire, the fuel pump will run and pressurize the fuel rails and hoses.

So, what you do, is just that. Jumper it and turn the key to ON. Then watch for say 20 minutes for fuel to gather somewhere. You might not see the source right away and have to remove the dynamic chamber/intake manifold to spy the leaking area. Have fun. I had a leak once and it was a pinhole leak in one of the rubber hoses under the intake manifold.

slitherz90gxl 02-19-10 08:41 PM

HAILERS; I've got a fuel pump switch under my cd player because my car is always flooding from low compression.
I'm guessing turning it on and trying to locate it would be the same, btw thanks for the advice.
Don't know why I didn't think of that before.

1SWEET7 02-19-10 10:15 PM

Well you would need to turn your fuel pump switch on, then still do the same thing Hailers said. The fuel pump will not turn on with the key to ON unless you jumper the check connector.

slitherz90gxl 02-19-10 11:39 PM

Really? Because my fuel pump sounds like a beast and I can hear it running when I flip the switch ?

HOZZMANRX7 02-20-10 12:04 AM

Not to break the fun, but have you thought about your pulsation damper? If you have any questions about that, the search button far above is your ticket to loads of info on that subject.

RotaryRocket88 02-20-10 12:06 AM


Originally Posted by slitherz90gxl (Post 9817348)
Really? Because my fuel pump sounds like a beast and I can hear it running when I flip the switch ?

The only way this would be possible is if you (or a previous owner?) bypassed the stock wiring to the pump. The AFM has a switch that prevents the pump from running if the engine is not producing vacuum. The test connector gets around this switch.

Pele 02-20-10 10:12 AM


Originally Posted by RotaryRocket88 (Post 9817386)
The only way this would be possible is if you (or a previous owner?) bypassed the stock wiring to the pump. The AFM has a switch that prevents the pump from running if the engine is not producing vacuum. The test connector gets around this switch.

I'm betting that's what happened. There are so many people out there that don't understand troubleshooting electrical problems that they just run wires all over the place...

If this is the case, then this guy has in my opinion, a SERIOUS safety issue on his hands.

Let's say he wrecks and is knocked unconscious. Maybe through no fault of his own... Drunk asshole T-bones him... So he's unconscious, car's all mangled, and the engine stalls. Fuel pump is still running though, and if there are any fuel leaks from the wreck, he's sitting in a puddle of fuel waiting for any small spark, say from a broken electrical wire that may also have been cut in the wreck.

slitherz90gxl 02-20-10 10:19 AM


Not to break the fun, but have you thought about your pulsation damper? If you have any questions about that, the search button far above is your ticket to loads of info on that subject.
That wouldn't cause a visiable leak in the front though?


The only way this would be possible is if you (or a previous owner?) bypassed the stock wiring to the pump. The AFM has a switch that prevents the pump from running if the engine is not producing vacuum. The test connector gets around this switch.
Yes, that is what they did. They put in a new fuel pump and then just bypassed the stock wiring.

HAILERS 02-20-10 01:08 PM


Originally Posted by slitherz90gxl (Post 9816892)
I'm almost certain it was just from my coolant res. It fills up with gasoline because of the numerous internal engine problems.
But I was wondering if there was anything towards the front of the engine bay? the puddle didn't look like it was under the engine more under the rad/fan.

There's absolutly nothing in front of the front housing on the engine that can cause fuel leakage, much less the coolant reservoir.

I did have a pinhole leak in a fuel line on a non turbo car and the hose ran from the primary fuel rail to the secondary fuel rail. But the spray of fuel from the pinhole leak was blown aft towards the rear of the engine by the fan. So I don't see how fuel could be in front of the front pulley assy at all. Especially with the engine running.

Fuel in the water? Going into the coolant reservoir??? Hard to picture a scenario like that.

slitherz90gxl 02-20-10 02:10 PM

I'll take pictures of my coolant res once I find my stupid usb cable to upload pictures with.
I'm pretty sure all that happened was once I shut the car off the coolant shots out the overfill because of the blown seals. The coolant dries up but the gasoline leaves a stain.
The coolant seals were blown because of a bad rad. cap about two years ago. It has ran 20k miles or more since then, and still running pretty strong; still redline it a few times a week.
I do get 8 or 9 mpg though.
That is why I'm swapping a TII though, I figure this engine has got to be pretty haggard on the inside.

st1llet0 02-20-10 02:21 PM

Ah, so your getting combustion gasses in your cooling system because of your worn/blown coolant seals, and making your coolant smell like fuel? I guess you get loads of white smoke too?

slitherz90gxl 02-20-10 02:40 PM


Ah, so your getting combustion gasses in your cooling system because of your worn/blown coolant seals, and making your coolant smell like fuel? I guess you get loads of white smoke too?
Yes, that is it. White smoke, blue smoke, black smoke.
It is like a rainbow of colors out my exhaust.
This is why I will not get rid of this car.

lonewolfrx 02-21-10 06:23 AM

never heard of gas getting into the coolant res before. i would fix that wiring for the fuel pump too while your at it.


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