I have a 1988 F-250 with a 4.9L 300ci l6 and ZF5. It has long tube headers, dual exhaust with a flow through cat and glass pack on each side. All of the emission equipment was removed except the O2 sensor and EGR pipe. I had to put a long block crate motor in it and it has between 3,000 and...

Ok so I put the check valves in and it seemed to work but didn’t completely fix the problem. Then I put a new pressure regulator in and it stopped transferring the fuel back and forth for about a day or so and now it does it again. Is there anything else that I could do to fix it or is that it?

Ok thanks

Ok. Do you know a place where I can get high quality check valves? I don’t want to get one and it break a month after I buy it. If you were putting these on your truck is there a certain brand you would use? Thanks for all your help.

We didn’t see anything like that on the lines. Where on the line does it go and does it prevent fuel from returning all together? I did not previously know about this, thanks for the information.

I got this truck a little over a year ago and we did a bed-off restoration. We dropped the fuel tanks and everything on the frame and painted the frame. We also put headers on the engine because the original manifold was cracked. In order to do this we had to delete all of the emissions...

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