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Old 09-14-2009, 04:59 PM
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Fuel lines

I am getting air bubbles in my fuel system. My car has a switch over valve before the IP to feed VO to the motor. (lets not start the VO stinks war here). I have not yet ran VO in this car.

I have a clear filter on the line from the diesel tank then another clear filter right before the IP. I see no bubbles in the one that pulls from the diesel tank but after going through the spin on filter and the switch over valve I have bubbles. I made sure the spin on filter was tight. next step is to replace all the rubber lines in the engine bay and (for now) bypass the switch over valves. What size line do I need and will the fuel line at autozone be ok for diesel?

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Old 09-14-2009, 05:19 PM
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You want 5/16" fuel injection hose. If you're running biodiesel or veggie oil you'll want viton lined or solid viton. The viton lined stuff is the SAE 30R9.

As for the air bubbles. It took me a long time to purge out all the air when I initially put in the VO. Nearly 100 miles before I got the last hiccough of air out. Try tightening all your hose clamps, and make sure all your fittings are tight. Do you have a looped return or no. A looped return will make it harder for the air to get out.
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Old 09-14-2009, 05:30 PM
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mmmmmm Diesel...
 
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Is the valve a Pollack Valve? They are known to leak.
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Old 09-14-2009, 05:39 PM
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I drove a few hundred miles just fine and then parked the car for close to 2 weeks and left town. My girl called me when I was out and said she could not start the car. I had her pop the hood and look at the filters and she saw the air bubbles. I told her to leave it. I got home and unlooped the return and hand pumped the primer and cleared most of the bubbles then went for a drive. After 25 or so miles there were still bubbles in there and some entering the filter. The hoses are ugly now so I figure I should just replace them anyway.
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Old 09-14-2009, 05:41 PM
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Quote:
Originally Posted by rrgrassi View Post
Is the valve a Pollack Valve? They are known to leak.
I am not sure if that is the brand. I am just going to bypass it for now since I am not going to run veggie in it till I have the time/money to finish up the conversion the right way.

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