Hey guys I need some more help.......

1. Brakes: I've got it driving but not at all happy with the brakes. They seem very sluggish and when I do stop and release the brakes you can see an actual hesitation before the pedal starts to come up and the brakes start to release. I have MII front disk brakes and drum rear brakes. I have a new CPP Power brake boooster conversion kit on it. A buddy stated that he didnt think the rotors and calipers were big enough but there seems to be other issues first.

2. Gas tank: I moved the gas tank to in between the rear frame rails under the bed and put in a (new) mustang gas tank. The engine is a Fuel Injected engine that has an in line pump. It gets the proper amount of gas preassure but the guy that actually put it in did not vent it and it gets a tremendous amount of pressure built in the tank after its been running. Any suggestions???

Thanks for all of the help that you guys have given me over the years.

Mark

 

The tank was designed to vent thru a charcoal canister with purge system. Is that still in place? If not, it either needs to be retrofitted or the tank needs to be vented to atmosphere.

 

The MII brake rotors were barely adequate for the Mustang II, although I would think they would stop better than the original drums. Your truck is heavier than a Mustang II. The gas tank issue could be solved either with a vent or a vented cap.

 

You might have air in the brake lines. Those small rotors and calipers should work. Did you bench bleed the master cylinder? Do you have good vacuum at the booster? Although, I don't think that's the problem. A vented gas cap should solve your second problem.

 

Hey Mark,
Your gas tank issue sounds very familiar. We also put a '70 Mustang tank out back between the rails with an electric inline fuel pump - when I'd stop I'd hear a very high pitched whistle coming from the tank. We put a vent tube over to a charcoal canister out back - that got rid of fumes but not enough air was able to come into the tank. Added a $17 vented gas cap from Summit & that solved it. (The charcoal canister route is expensive at $200 or so & not super effective - I'd go with a vented gas cap as suggested above).

Brakes - Can be very frustrating - Our brakes were hanging up & slow to come back up. There is a rod between the pedal & the master cylinder - our's was 1/8 inch too long & would stay engaged & leave pressure in the system. Air in the lines can be a pain & is very common.

Good luck over there! You are getting there - Nice truck.

Ben in Austin