kick7ca

If I installed all new fuel lines around the fuel rail which were too narrow would that increase my fuel pressure?

I've had a too low idle, no idle, flooding problem (won't idle or run correctly) took it down to bare block and found a huge puddle of gas in my exhaust manifold.

Trying to figure out why all the fuel...
My injectors where just cleaned by cruzin performance

HAILERS

Install the fuel pump check connector with the intake manifold off and look for the leak. Make sure the key is to ON when doing it.

RETed

It's next to impossible to fit smaller diameter that stock hoses onto the fittings.
I have this BAD feeling you're using CARB fuel hose - you can't do this.
You need HIGH PRESSURE FUEL INJECTION hose which is like $5 / foot.
The carb hose will start to crack and leak on you!


-Ted

kick7ca

The bad feeling must be something you ate It was brand new fuel injection fuel hose. I just noticed it was marginally smaller than the old ones, and I had to cut it off when I removed it, no way would it slide off.

You guys don't seem to be biting on my hypothesis of too much fuel pressure caused by fuel lines too tight around the rail. Wouldn't reducing the inches increase the pounds in PSI?

The excessive fuel seems to be my culprit, and up until now I had dismissed the notion of a leaky injector as they've just been cleaned and flow tested with a A+ report card. I've never had the problem before.
The only changes in my fuel system was cleaned injectors, new PD and new fuel lines around the rail.

Yet it is dumping fuel. TPS checks, water thermo checks out.
Gotta get some more fuel hose and set them up as HAILERS suggested.

HAILERS

Nope. You just remove the upper intake manifold and leave the fuel injectors in plave. Then jumper the fuel pump check connector (yellow two socket plug), turn the key to ON to make the pump work, then watch for the leak. Give it fifteen to twenty minutes. Then recharge the battery. humor.

kick7ca

HAILERS thanks but I'm not sure if you understand my situation.
The fuel system has NO external leaks. I've pressurized it several times.

The fuel is pooling INSIDE my exhaust manifold, meaning it was in the motor first. Big time flooding. If there is a leak, it has to be from the injector spray nozzle, in which case it can only be observed with the fuel system off of the LIM and pressurized so that I can see the bottom of the injector.

But I just had my injectors cleaned so they shouldn't be leaking, that's why I'm a bit stumped.

buttsjim

Quote: "You guys don't seem to be biting on my hypothesis of too much fuel pressure caused by fuel lines too tight around the rail. Wouldn't reducing the inches increase the pounds in PSI?"



I made a "D" in fluid dynamics, but I believe there are two pressure components--the static pressure inherent in the piping arrangement, and the dynamic pressure due to the fluid flow. Too small fuel lines would increase the system static pressure, and decrease the pressure at which your fuel flows. As a result, you'd probably end up with slightly less fuel flowing with a little less pressure, at a little higher velocity.

Then again, maybe that understanding is why I got the "D"!?

JamesBong

Putting smaller lines in is just like adding a resister in an electronic circuit. It'll reduce the flow, but I doubt that your fuel lines are that small. They would be impossible to get on in that case. New fuel lines won't cause this to happen. My new lines were difficlut to put on as well. They should be, so that they don't leak. Have you checked your fuel pressure regulator? Have you tried hooking up a fuel pressure gauge? It almost sounds like you might have an injector stuck open. I know they just got cleaned, but anything can happen.

WAYNE88N/A

One of the injectors I had cleaned at Cruzin about a year ago crapped out after only a month or two, so don't discount a bad injector...

It's not like he's overhauling them, as they should be...

RETed

So tell us smartass, what size did you buy?


-Ted

kick7ca

5/16. And yes I can sit on ice cream and tell you what flavor it is.

kick7ca

If my "theory" had any truth to I think someone would have piped up by now.
My wires for my injectors are pretty shabby, could be grounding out between block and TB.

Thanks axe this thread if need be.

RETed

Wow, you replace it with...stock size fuel line.
WTF you asking queastions about smaller fuel line when it's the same size???


-Ted

kick7ca

Cause it was marginally narrower than what I removed and I couldn't understand all the fuel in my manifold. Like I said moderator can delete this thread the problem lies elsewhere.

thanks

CompuBob

you must have a leakey injector, I doubt using smaller fuel line will solve your problem, thats just trying to get around it. people who install aftermarket fuel pumps with higher pressure do not have this problem.
and remember, without a fuel pump rewire your not even getting the full potental out of your stock fuel pump.
I would definatly replace your fuel injectors. if you need to get ahold of some I know someone locally who has piles of S4 TII injectors.

you can also get a a fuel bypass connector (I dont know what it's called) but it relieves the pressure in your fuel lines very quickly after you turn off your car, this would stop flooding when the car sits.

eventhought you got your injectors cleaned.. at least one of them could be bad!

JamesBong

Ted, Relax, he was just asking a question to see if his hypothesis had any merit. It's called "the learning process." Give him a break.

Kick7, We all ask questions that, in retrospect, didn't seem so smart. But if we didn't ask any questions, we wouldn't learn anything. The reason your new fuel line was slightly smaller in diameter is because it's new. All of the hoses tend to expand and get brittle as they age. Kinda like people.

RETed

Yeah, I guess you forgot all the smartass comments he included with his replies.
Wow, how convenient...


-Ted

HAILERS

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Yep. I didn't read it right. In that case you'd maybe pull the fuel rail up and zip tie the injectors to the rail and then pressurize the rail and look for leaks. You might not see any leaks though. It might be an injector that leaks when it gets up to operating temps. Then again you might see it. Never know til you do it.

You know that the fuel rail will hold somewhere near 35psi after you shut down? And it takes quite a while for the pressue to decay? Over twenty to thirty minutes I believe. So a leaking injector could cause the puddle. And a smaller fuel line would not, but 5/16 is the right size so thats out of the question anyway.

kick7ca

Sorry if I sh*t in your cornflakes Ted I just couldn't resist - I wouldn't be silly enough to use carb fuel line. Really, I appreciate you responding to my original question.