No fuel pressure till the asd relay clicks1993 jeep

Check the main relay and fuse.

ask to Drop out you mean. blow would shoot the ASD relay cloudwards. LOL but may be it is,, there is always a first.
loosing fuel pressure, what does that mean?

1. i just think it.
2. the fuel rail fitting cracked open a bit, is dry, cranking.
3. fuel pressure gauge (a tool in any shop) reads 0 psi.
4. ? surprise me.?

which engine.????

why guess?

ill assume the full 60k mile tune up was done.

you picked the most hard fix of all and guessed wrong, wow.

if the engine is good, compression great.

there are only 3 causes of stalls, in pure Physics. bla bla....

in reality parts wise over 50,, guessing is not going to work.



what does worK? diagnosis, want to test or guess.?

on all jeeps we have this funny thing called ASD,

but first, i must ask a key question. can your right FOOT save the stall if it gets happy footed , at the stall point?????? bid deal important that.?????



ill pretend NO, for THAT.( post the facts ,im showing real tests , and real results here) yours will vary.....



lost spark?, is the cause, not fuel.? (efi cuts fuel for loss of spark in the ECU LOGIC, so spark is first ,if hot compression is not dropping)

but id check the ASD next or drive with a scan tool attached (any) and see the PCM/ECU tell you why it stalled ! , it will 1/2 the time.



in addition to that, the ASD relay must be monitored, (scan tool will do same)

if the RELAY DROPS? then we know why , see?

see the 8 ways to DROP and ASD here !

http://www.fixkick.com/Jeeps/ASD.html



see those, if they drop , each tells you why.

if the ASD did not drop, then it starved for fuel. (compression good)

Examples more./......

say , you get no DTC errors (scanned), and ASD holds fast,. at stall?

more examples::::

does it starve for fuel with gas cap loose , then wrong cap

its missing the vacuum breaker inside, a 5 buck fix. and kids can change it. or worse?, caused it.LOL

More examples:

we use a fuel pressure guage at the fuel rail (TOOLS RULE)

if the pressure drops, at stall , and not ASD drop.?

then you have bad wiring from the fuel pump relay to the tank pump.

or a bad relay. the volt meter will prove that.. easy.

very common on all EFI cars, bad wiring, and 10x that in the salt belts.

google salt belt, or wiki it.



this is how all 1993 jeep to present run. ASD is first to watch , hint.!

ASD dont drop:

if fuel pressure is good?, then wrong tree to bark up.

if fuel pressure was low, check voltage to pump cranking

must be 12v, or 11, if cold and battery weak

less voltage , is BAD. fix bad. (clean connections.)



only takes 3 tools.

1. volt meter



2. compression gauge.



3. fuel pressure gauge.

a vacuum gauge part of a hand vacuum pump is nice.

most fail paths can be found with minimal tools. about 60 bucks worth. in any DIY shop.



and sorry , you cant fix modern cars with out a scan tool

buy, rent or barrow one. they are everywhere.



all answers, USA and no engine stated so 100% generic answers.!

not flex fuel opted, not CNG engines.



and P0181 not set, pump dead, error fuel pump.



see this page.

here,

click WJ

click Emission

click on diagnosis section see all those DTCs, get any????

no P0215?

loss of cmp , loss of CKP

gross missfiring? codes.

endless really, scan it. at stall , scan it.

fsm

here



http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service



free.

which engine?
fsm covers this.
ZJ car.
just RTM it here.
under wiring
page 8w-30-3
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

why not?
post symptoms, and ask for help
do you have no fuel pressure cranking?????
or dont know how the ASD controls this>
ASD 101:
http://www.fixkick.com/Jeeps/ASD.html

on many cars , you need to crank it.
some have the prime key on for 3 seconds.
on jeeps.
check fuses first
check the ASD relay, if it dont energize the pump relay will be dead.
ASD >>> Fuelpump relay.

on jeeps, the ASD drops after 3 seconds, if the PCM sees errors.
http://www.fixkick.com/Jeeps/ASD.html

did you check all fuses with a meter ?
you are new to jeep repairs.... here are some facts.
jeeps have ASD relay.
when car dont start, see what the ASD relay is doing
do not throw parts, you picked the most hard and expensive thing to change on a lark. why do that?
the fuel pressure gauge is $20 and takes 5min to see that fuel pressure is good. not pulling the tank and pump. for fun.
why do that.? (seen 100000 times on forums, this....)
here is mr. ASD, and what to check.
the ASD can cut fuel and spark for many causes. x8

http://www.fixkick.com/Jeeps/ASD.html

automatic shut down relay.

does the relay close cranking? y/n ?
if yes, does it then drop out cranking, y/n?

those are the first 2 tests on all jeeps 1993 to now.

each check discovers what is wrong
so does attaching any OBD2 scan tool and cranking
for 5 long seconds and behold, DTC errors.
got DTC errors cranking/??

BINGO x10.

under the hood you will find a fuse box that has a relay in it called an ASD relay.. its about one inch square. the lid of the fuse box will tell you witch one is the asd relay.. you can swap it with another relay in that box to see if the truck will start. if not check to see if you have spark and fuel pressure..

This is a delay to power the fuel pump. You need to check the output from the ECU/ECM. check for any error codes, check if there is power from the switch. Once the engine runs , you need to see if there is any error codes or faulty symptoms.

if it starts using ether, it suggests a clogged fuel filter. You need to know what the true psi value is across the fuel rail. you can rent kit from major auto parts stores. be it remembered that many cars nowfays have 2 fuel filters- one in tank and one on frame or firewall. a quick check is back pump air through your fuel line till you hear bubbling. recheck fuel pressure and note diffetence. if it goes up you probably icked up larger debris on the screen.

could be the pump? or the pump relay? or even a clogged fuel filter crack the line going into the rear of the filter and crank the motor if fuel comes out ? change the filter if no fuel then? check the relay and or change the pump