first time posting here...
maybe your fuel tank is not vented thru the gas(!) cap, and that's the reason the primer bulb collapses...not sure if the tank could be crushed/deformed by the injection pump sucking it empty...sweet engine bay, by the way...
good luck...
This is what i thought at first knikula , so i took the cap off and tried it , but just the same. As earlier post tank is venting ok , it was the primer bulb all the time
cheers kirk
first time posting here...
maybe your fuel tank is not vented thru the gas(!) cap, and that's the reason the primer bulb collapses...not sure if the tank could be crushed/deformed by the injection pump sucking it empty...sweet engine bay, by the way...
good luck...
This is what i thought at first knikula , so i took the cap off and tried it , but just the same. As earlier post tank is venting ok , it was the primer bulb all the time
cheers kirk
you know that black line that comes up with the fuel lines, then just goes back down into the frame rail? yea.. thats the tank vent. nothing to do with the cap.
and i figured that it was the primer bulb, because my grandpa tried doing that exact thing (primer bulb in the FEED line, not return) and the pump produced enough vacuum (it doesnt take much to suck those bulbs closed) to collapse the primer bulb..
his truck did the EXACT same thing, until i borrowed his truck one day, and removed the primer bulb. he wondered why it had alot more power, then i pointed out the fact that his primer bulb was now just a straight-thru brass coupler..
Well, let the exhubrence of youth craft a similar barrier that keeps the smells and water vapor out. I actually do like the cap he fashioned. But there is a reason the automotive industry puts those barriers in there. I can envision one that sneaks around the heater and the wiper motor both that would still leave most of "the LOOK" he has strived so hard to achieve. And done so well by the way.
Is the hood waiting for a pad to install or is that always going to be naked like that? That is the sound issue that so many of us have with our diesels. It is nice to have that clacking noise going on in your ear while you work on the engine but let me tell you that after 4 hours in the car the drone is enough to make your head pound.
Young and foolish, wouldn't we all like to be that again? Oh wait, that is what my friends tell me about me when they see what kind of car I drive.
I wouldn't be too scared. It would probably just be like taking the weekly shower, whether you needed it or not.
Water isn't the only trouble I see here. How about dusty roads. Those wheels are going to churn it up and billow it into the engine compartment. If you don't seal it from the top of the hood line there will be much more coming in from underneath than what might come in from the top of the hood or the windows. Ever watch the turbulence at the ground level of a tire? Ok on a straight drive but now turn right and where does the trailing edge of the dust go from the front right tire. Into the engine compartment. Not so good.
Think about it and let us know how it works one way or the other.
DAS
someone had a BMW cabin air filter in their mk1 a long time ago on ebay. That may help with both dust and water if you find out which one it was post it up.
An engine fire while the blower was on high would be exciting.

Pull off about three of these and lay them over the heater vent intake. Secure with large rubberband.
Place unused roll behind seat for use in rain, as needed to defrost and if needed wipe personal rear when interior fills with smoke and you can't see where in the heck you are headed.