Don, you might think in terms of something shifting forward on downhills?  Could be causing strain on some wiring conn?  Coil loose in its bracket?  Something under back seat pushing on ECU?  Maybe jack up the back of the van and see if you can cause it to happen. Good luck and let us know what it was. 

Dan
Country Homes Camper, the Huckleberry Sky

> On Sep 14, 2018, at 8:18 AM, Don Hanson <dhanson928@GMAIL.COM> wrote:
> 
> Lucky me, I found an idle control module (~$200?) in the box with my spare
> ECU that I paid $35 for when I installed this $300 Jetta ABA motor....
> Now, if that works...
> 
> Thanks for the help, love the List
> 
>> On Fri, Sep 14, 2018, 6:16 AM mike riley <mkriley1@hotmail.com> wrote:
>> 
>> sounds like a leaking pressure regulator or check valve in pump.
>> 
>> the ecu shuts off fuel pump on down hill and there is no prime when turned
>> back on. key on and off primes it.
>> 
>> mike
>>