4KQ fool pump and brake MC

[Huw Powell]

> A signal from the tach activates the fuel pump relay?  I thought it 
> used to turn on as soon as the key was turned on.

The tach signal is required to keep it on.  The brief activation upon
"key on" was determined to be a fluke due to that.  Otherwise it doesn't
run til the engine is turning over.  And stops when the tach or power stops.

> Brake pedal gets a firm spot, but real close to the floor.  I'll try 
> another bloodletting, er, um, bleeding.

Oh, that may also be a sign of one of the two circuits failing (internal
leak).  It then takes longer for the other circuit to pump up.

>> Fuel pump on milady's 4kq camping car won't run unless I jumper the
>>  two big spaces in the relay tray. Then it runs fine. Put the relay
>>  back in and it won't run. Is the pump drawing so much juice the 
>> relay won't pass it on or is the relay just toast? Car has been 
>> sitting a month or more.
> 
> 
> The relay is probably bad, it would be nice to test with a known good
>  spare, though. If somehow the tach signal is not getting to it, it 
> would not "turn on".
> 
> 
>> Brakes work OK, but used to be really effective and didn't take a 
>> lot of pedal to operate. Today the pedal almost hits the floor. 
>> Reservoir is at "Max" like it has been since I flushed the system 
>> last summer. Did the MC maybe burp and lose some of its seal? Do I
>>  need new?
> 
> 
> Is the pedal firm eventually, or does it sink under pressure? A 
> sinking pedal with no leaks tends to indicate a bad master. A soft 
> pedal that reaches a firm point tends to indicate air in the system, 
> although how it could get there without lines being opened recently 
> would be a mystery.
> 

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/