Need help w/ stumbling issue....

Z-linkCobra · #1 (**permalink**) 10-07-2010, 04:22 PM

A retun line is not a bad idea even with a manuel pump....but it is by no means a must. A return line even plumbed back into the main supply line further back in the system will work just fine as well. The pump will pump fuel no matter where it comes from.

A return line does help recirc. fuel and allows it to cool some as it goes back to the rear of the car, thus avoiding vapor lock.

Your problem could be as simple as a bad pump or a leaky diaphram on the acc. pump.

Thank you Red......for once I was faster...lol.

John-Tucson · #2 (**permalink**) 10-07-2010, 10:58 PM

Mark, You didn't mention what your water and oil temps are when this happens. John PS. Did you put a shroud on the radiator ?

azfordman · #3 (**permalink**) 10-07-2010, 11:11 PM

In stop and go traffic the temp will get up to around 90-95 c, but as long as the car is moving it stays around 75-80 c. I have still not found anyone local who can make a fan shroud for me, but working on it. Even driving home from the pub tonight, with the colder temperature, the car ran like a bat out of h-e-double toothpick! There has to be something with the heat and this crap fuel, so if I have to replace the fuel pump I may as well go with an electric one to keep pressure on the fuel lines and eliminate any and all possibility of vapor locking..... John, if you and any of the other Tucson guys want to get together for breakfast one of these mornings just let me know. There is a great little diner on Silverbell that serves a great brunch on the weekends.......

John-Tucson · #4 (**permalink**) 10-07-2010, 11:32 PM

Mark, we are all burning the same fuel. I've been really busy the last two months, hopefully we can get together and solve the shroud problem. Don't jump into changing the fuel pump just yet. I tried to call you 1/2 hour ago but you weren't in. Hope you can make it this Saturday, we'll have a couple of "gear heads" along and they can discuss the problem with you.

vettestr · #5 (**permalink**) 10-10-2010, 12:13 PM

You make me dizzy jumping from issue to issue but then again I am easily confused. Here is a link to Jeg's page of fan shrouds. I am sure one will be close enough to work.

On the vapor lock issue use a insulating gasket like this one will help. http://www.jegs.com/i/Holley/510/108-51/10002/-1 although any local parts store will have similar gaskets.