Excessive Cranking on start-up, Assistance request Options

[Van B]

Hello scholars and masochists.

I’m requesting help on solving the issue of excessive cranking on start-up. Not once since I bought the car has it ever fired right up like others described for their cars. I had hoped that this issue was related to the other issues I’ve solved with the help of my friends here, but no luck. The behavior remains unchanged.

To start this off, I rigged a little hidden fuel pressure gauge to the car so that you all can see for yourself. For the context of this attempt, the engine is cold at around 60F, I did not touch the throttle and the ignition was in the on position prior to cranking.

https://youtu.be/DTTQ1zQJkJo


https://www.youtube.com/watch?v=DTTQ1zQJkJo


Edit: moving on to a new phase at post #152

http://www.914world.com/bbs2/index.php?s=&...t&p=2995793


Please advise and thanks in advance.

Van

[StarBear]

For what it’s worth: after sitting for several days mine cranks 3-5 times then starts. If sitting a long time like 2+ weeks it takes 5-10 cranks. If only 2-3 days it pops to start right away with only 1-2 cranks. So, me thinks it holds the pressure for a while but not forever. BTW I replaced all my fuel lines only a few years ago.
I like the fp spring/tit explanation.

[wonkipop]

For what it’s worth: after sitting for several days mine cranks 3-5 times then starts. If sitting a long time like 2+ weeks it takes 5-10 cranks. If only 2-3 days it pops to start right away with only 1-2 cranks. So, me thinks it holds the pressure for a while but not forever. BTW I replaced all my fuel lines only a few years ago.
I like the fp spring/tit explanation.

sounds reasonable.

i have left mine on occasion for two weeks.
what you describe as a 3-5 crank start is needed.
probably all pressure has drained by then. but its still a fast start. never 10
but f p in original position likely pressurises very short fuel circuit.
you have a pump in front don't you @StarBear ?

the only time i have to do a 10 crank start is a hot start on a hot day.
thats fuel boiling in the fuel line run from tunnel outlet to fuel pump in my case.

van can fit an inline check valve easily if he felt the urge.
just after the fp.
that will at least confirm his pressure loss location.

i retract my earlier view that it isn't the pressure regulator.
it could be.
if it had gunk stuck under its valve.
but i doubt it because his loses pressure instantly so i think it would have a great deal of trouble holding it in the first place. and it does hold pressure.
the other way they fail is more spectacular, sending fuel through vac line to plenum.
you would know about that, be more than a 10 crank start going on.

[StarBear]

For what it’s worth: after sitting for several days mine cranks 3-5 times then starts. If sitting a long time like 2+ weeks it takes 5-10 cranks. If only 2-3 days it pops to start right away with only 1-2 cranks. So, me thinks it holds the pressure for a while but not forever. BTW I replaced all my fuel lines only a few years ago.
I like the fp spring/tit explanation.

sounds reasonable.

i have left mine on occasion for two weeks.
what you describe as a 3-5 crank start is needed.
probably all pressure has drained by then. but its still a fast start. never 10
but f p in original position likely pressurises very short fuel circuit.
you have a pump in front don't you @StarBear ?

the only time i have to do a 10 crank start is a hot start on a hot day.
thats fuel boiling in the fuel line run from tunnel outlet to fuel pump in my case.

van can fit an inline check valve easily if he felt the urge.
just after the fp.
that will at least confirm his pressure loss location.

i retract my earlier view that it isn't the pressure regulator.
it could be.
if it had gunk stuck under its valve.
but i doubt it because his loses pressure instantly so i think it would have a great deal of trouble holding it in the first place. and it does hold pressure.
the other way they fail is more spectacular, sending fuel through vac line to plenum.
you would know about that, be more than a 10 crank start going on.

Yep; in the front. Replaced all the fowl lines at the time. Braided stainless (I don’t race).

[wonkipop]

For what it’s worth: after sitting for several days mine cranks 3-5 times then starts. If sitting a long time like 2+ weeks it takes 5-10 cranks. If only 2-3 days it pops to start right away with only 1-2 cranks. So, me thinks it holds the pressure for a while but not forever. BTW I replaced all my fuel lines only a few years ago.
I like the fp spring/tit explanation.

sounds reasonable.

i have left mine on occasion for two weeks.
what you describe as a 3-5 crank start is needed.
probably all pressure has drained by then. but its still a fast start. never 10
but f p in original position likely pressurises very short fuel circuit.
you have a pump in front don't you @StarBear ?

the only time i have to do a 10 crank start is a hot start on a hot day.
thats fuel boiling in the fuel line run from tunnel outlet to fuel pump in my case.

van can fit an inline check valve easily if he felt the urge.
just after the fp.
that will at least confirm his pressure loss location.

i retract my earlier view that it isn't the pressure regulator.
it could be.
if it had gunk stuck under its valve.
but i doubt it because his loses pressure instantly so i think it would have a great deal of trouble holding it in the first place. and it does hold pressure.
the other way they fail is more spectacular, sending fuel through vac line to plenum.
you would know about that, be more than a 10 crank start going on.

Yep; in the front. Replaced all the fowl lines at the time. Braided stainless (I don’t race).

you running your car on roosters instead of petrol.
is that some kind of secret racing fuel?
(IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/beer.gif)

---

sitting here thinking how my car is still running on lots of old fashioned stuff.
points.
orig dist.
very likely original coil (i've never changed it and its prehistoric looking black coil).
etc.
and it starts bam. (IMG:style_emoticons/default/smile.gif) go figure.

its days are numbered but. they are vintage points i have and the box is going to be empty soon enough. and the aav is almost ready to fall out of its wheel chair.

when we dropped the gearbozx to do the clutch we found one of those stoopid rubber core clutches in there. so we knew it was the showroom clutch. funny thing is it wasn't worn out. but the rubber had turned to something that wasn't rubber anymore. the stuff was probably not rubber but an evil compound invented in WW2 as a substitute for truck tyres on the russian front.

always been suss on the shift fuel pump to front of car move.'
a million people tried to get me to do it back in the 90s.
i didnt. mostly because i never suffered from a vapor lock problem with the car so why fix something that wasn't broke.

seeing van's problems there sure seems to be some ways you can mess with power supply to pump with 1,8s that doesn't matter so much with d jet.

van's going to have a pretty damn good car the way he is going at it.
(IMG:style_emoticons/default/beerchug.gif)

side benefit = following all this research.
i'm already out on the trail of BMW aavs to go with the SAAB one.