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

[underthetire]

ok, not sure I can help but...
If it won't idle and dies at full load i'd check the charging system. You didn't specify what year/injection you have. Without a pressure gauge you really are guessing at a fuel pump IMO. I would check the grounds under the plenum, unplug the air temp sensor on the plenum. The olnly way I can see a plugged line cause this would be a supply line/filter. The other side just goes to the injectors and pressure regulator and back to the T fitting on the pump and back to the tank. It could be the pressure bypass valve on the pump went bad (IMG:style_emoticons/default/confused24.gif)

[jsayre914]

ok, not sure I can help but...

yes you can, thanks (IMG:style_emoticons/default/smile.gif)

If it won't idle and dies at full load i'd check the charging system. You didn't specify what year/injection you have.

It chokes at any rpm when the pump stops, no lights come on in the dash, and if i goose it a few times it catches again. The fi is a 74 1.8 l-jet.

Without a pressure gauge you really are guessing at a fuel pump IMO.

i have an inline fuel pressure guage, it reads about 30psi, when the car dies it reads zero, i cant see it fluctuate because i am in the drivers seat.

I would check the grounds under the plenum, unplug the air temp sensor on the plenum. The olnly way I can see a plugged line cause this would be a supply line/filter. The other side just goes to the injectors and pressure regulator and back to the T fitting on the pump and back to the tank. It could be the pressure bypass valve on the pump went bad (IMG:style_emoticons/default/confused24.gif)

i will change the filtre if and when i get home tonight, that was my original plan. not sure about a bypass valve or where that would be.

thanks for the ideas
(IMG:style_emoticons/default/beerchug.gif)