Does fuel pump (injection) cut off if clogged?, YES i searched and read all 20 pages Options

[jsayre914]

On a bosh fuel pump (3 tit) does it cut out if it cannot get fuel?? I realize if it is intermittant it is probably a loose connection, loose or bad relay, loose pin on board, or dirty fuse on board, etc.

i am at work, and i am not so sure i will make it home tonight, i have a few tools, but no electrical stuff with me. i was wondering ....

what would the pump do with good power and a clogged line??


i made it half way to work and the pump cut out 3 times within 1 min, then dead. i pulled over checked the pump and all connections tight. i tried to start it 4-5 times, heard the pump run for 1 sec then dead. crawled under and shook the filtre and banged on the pump. it started but would not idle. i then loosend the clamp holding the pump and turned it upside down. car started and kept strong at high idle but started to choke below 3500 rpm. I risked the drive into work, and made it idling between 3500 and 4500, it would start to cut out and i would downshift jump the rpm and it was ok again.

welcome to my life

[jsayre914]

i am reading...thanks Rich.

test one. check voltage distributor plugs wires etc. good
test two. mechanical stuff, starts good just wont keep idle for too long.
test three. all hosses are brand new not kinked and secured well.
test four. key on flapper test. Perfect and holds at 37psi no problems

(IMG:style_emoticons/default/WTF.gif) i thought i would have found some problem there???

test four a. crank engine you can hear pump running. good.

this is as far as i got so far.

The website seems to have many broken links. i really wish the links were working, cause i need to do more testing. great site (IMG:style_emoticons/default/beerchug.gif)

[Millerwelds]

I recently went through some fuel pump issues on my 2.0 DJet. Turned out the pump would go into bypass mode and circulate fuel right back to the tank bypassing the engine. The pump would always run but I would get no fuel pressure. I ended up taking the pump apart and removing the bypass parts so both the output line and bypass line were wide open and then I plugged the bypass line. Essentially turning it into a two port pump. Has worked great ever since. Without the bypass valve the pressure will drop off as soon as the pump is off as opposed to holding pressure for 20 minutes or so.

Almost everything I read said that the pump would leak once opened up but I was able to use a flat tip to 'crimp' the cap back on and it does not leak. I figured I was going to need a new pump so I might as well try to fix this one first.

Good luck! (IMG:style_emoticons/default/driving.gif)