I'll see if I can find it and post.Brand new Spectra Premium fuel sending unit (aka fuel pump hanger) for all 1984-1987 Vin 9 (non-intercooled 3.8 SFI Turbo) & Vin 7 (intercooled 3.8 SFI Turbo) Buick Grand National, Turbo Regal, and 1987 GNX with analog or digital dash. I think I have a picture of the vent someplace. If the car goes shiny side down it helps prevent the loss of fuel. The little can thing over it is a rollover valve. Maybe use one of those either T'd off before the CCP control valve, or in place of it.īut as TurboFab mentioned, the vent line has a restriction in it at the tank. Somewhere around 1 psi on both in & out of the tank. This mushroom vent valve has low cracking pressures. And the cap needs a good seal as it is rear center as on our Buicks. Once I got a gas cap with a good seal on it the tank will build a lot of pressure. I have an older car that I converted to EFI that has this problem. Which is normally taken care of by the CCP system. As the fuel is heated a lot of pressure will/can build in the tank. With a return style fuel system the tank needs to be both pressure and vacuum vented. If the CCP is removed and the line plugged, the tank vent will work to relieve pressure, and also allow air into the tank. So fumes should go to the canister first. The CCP control valve has a lower cracking pressure then the tank valve. The tank vent valve, looks like a plastic mushroom and sits above the rear axle, allows air into and out of the tank. The CCP control valve is a one way into the canister. Feed, return, CCP system, and a pressure/vacuum vent. On these cars there are four lines from the tank. There is a vent valve that is used on 3rd gen f-body EFI cars.
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