: car starving for fuel below 1/2 tank
Dec 4th, 09, 09:13 AM
Got a 69 Camaro with LT1 new high pressure tank from Paddock, Suppost to be set up for efi in 69 camaro. But when it gets close to 1/2 tank it starves for fuel when i get on it , or when i go around a curve. A awile back someone posted an article about a antisurge tank between the fuel tank and the engine. Had it saved as a favorite but gone now. Looking to do something like this over the winter. Does anyone have any direction on the best way to go on this. Runs fine as long as tank is full.
Dec 4th, 09, 12:54 PM
John we're not ignoring you, just need more info. Describe your pickup inside the tank. First place to look.
Pressurized tank???? Have you called Paddock?
Dec 4th, 09, 06:25 PM
I know Jim likes to keep everything here and for good reason, but I think I've seen several posts about that tank and its issues over on the pro touring forum. You've got to be steamed considering how much that tank costs.
Dec 6th, 09, 08:43 AM
the tank was suppost to be set up for this. Bought new for $600 with pump and sending unit already in it, installed it and havn't had it back out yet. Was waiting on the season to end before tearing into it. It's over as of yesterday, had to drive in the
christmas parade. Trying to prepare for what i need, or what to look for. when i take it back out. Also had another problem yesterday with car, sputtered and died while driving home last night, Ran good all through the parade and and for 30 miles after, Pump would come on but would not start. Let it set for a couple minutes, started went a couple miles done it again, done this 4 or 5 times before getting it home. Don't know if problems are related or not. Any ideas.
Dec 6th, 09, 09:04 AM
It's a badly engineered tank. A prime example of building a part and not testing it. It happens way to often in the pro-touring end of things. You have a tank that doesn't have proper baffling. It's not easy or cheap to do right. I know guys are using surge tanks but that will only get you so far. You either need to cut open your tank and fix it or do the best you can or put a surge tank on the car and hope it gets you a little more drivability. How is the tank vented?
Dec 6th, 09, 12:16 PM
Don't know if it is vented, how should it be vented. And how should it be baffled I'm going to pull it back off this winter and put a surge tank on or fix what i have someway or another. Have a friend that runs a welding shop we could probably modify what needs to changed if had some directions. P.S. Started car today let it run for over 30 mins could not get it to sputter or die.
Dec 6th, 09, 12:28 PM
Don't know if it is vented, how should it be vented. And how should it be baffled I'm going to pull it back off this winter and put a surge tank on or fix what i have someway or another. Have a friend that runs a welding shop we could probably modify what needs to changed if had some directions. P.S. Started car today let it run for over 30 mins could not get it to sputter or die. Good thread,
Like Todd said. Vented either a vented gas cap or 2-lines from the tank one feeding the fuel pump and the other venting back to the tank as a vent.
Dec 6th, 09, 04:52 PM
Yep, you need a vented gas cap or a seperate vent to the atmosphere. When your car consumes fuel it must be replaced by air or it will vapor lock. You may very well have two issues here. Baffling and venting.
WES 1967 yenko clone
Dec 7th, 09, 06:25 AM
If it is a SPI tank,they are aware of the problem and are working on a problem. I should have one in my car any time. I will keep you all posted.
Dec 7th, 09, 07:30 PM
I'm not running that tank but with my FI system they specifically say that a vented cap is not enough. I put an elbow in my fuel filler neck and ran hose up into a charcoal canister in the trunk and then back out by the filler neck with a small fuel filter on the end to act as an air filter.
Dec 11th, 09, 09:43 AM
It has a return line running back to the tank from the fuel rail, it has the orginal gas cap that came off my old tank, fit on the new tank. does the return line serve as a vent? if so, i'm covered. So must be a baffleing issue. If someone had some pictures or a idiot sheet to show how it should be i could probably fix it myself with the help from a friend. I' m off work the week 24th through the 3rd, will pull tank off then and see what i do have,
Dec 11th, 09, 10:10 AM
Steiner, the original vented cap is wide open when no pressure builds in the tank. I'm certain that the instructions saying the vented cap isn't good enough is BS. For it to not be good enough the engine would have to make 20,000 hp. (OK, that's a guess) But still, with a carb, the fuel is going through a needle and seat just thousands of an inch wide. The larger fuel lines on our cars only help with friction flow-loss.
John, did your cap hold pressure when it was warm outside, (a whoosh when opening) and come off easy when cold? (no vacuum) If so, the cap is fine. That means the pickup is defective.
Dec 16th, 09, 06:25 PM
For future refrence--There is No reason to buy a hi $$ SS tank for an efi conversion---or run a return line to the tank, just check out the kick *** surge tank at zenith fuel systems under ZeemsII They call it a fuel cell, it has an internal low pressure pump tp get the fuel from a stock 60's tank to the fuel cell where a high pressure inline pump just downstream can take it from there, you run your return line to the "fuel cell".
Dec 17th, 09, 01:25 PM
Seems to apply to smaller engines. Interesting though. Anyone put one in?