milligan_17

okay so i have a early 1984 944 na and im getting no fuel pressure i replaced the dme relay cleaned the reference sensors(still no tac bounce but my tac rarely works so that may be why. I tested to see if any voltage was going to the fuel pump as sonmbody tried cranking it over and got 0's across the board. so then i took out my battey and used jumper cables to hook it up directly to the fuel pump and heard spinning. Im lost. and of course this all happens right after i paid for new tags anyways any suggestions?

bonus12

If you havent already, first and easiest thing to check is battery cables at the terminals. How do they look?

Otherwise, what else can you tell us? Was it running before, etc? Sounds like your getting fuel, and youre probably getting air, so maybe youre spark is bad? Tell us more.

milligan_17

it was running then it just stoped im getting air and spark(if I use cold start on air intake i hear it starting to fire) but there is no fuel to the rails. im getting power from the terminals the starter will crank the car over theres just no afm in the cylinders. if i unbolt the cap at the end of the rails its dry

Van

It's not out of gas, is it?

milligan_17

yes it has fuel. the pump dosent spin under ignition only if hook it directly up to a 12v battery

PorscheDoc

Did you check the fuel pump fuse?

milligan_17

that slipped my mind.. its the little things that get me which fuse would it be though and what color should it be i have a bunch of spares laying around

milligan_17

so to recap my problem is no fuel but there is spark. i replaced the dme relay and cleaned the reference sensors. no voltage is getting to my fuel pump but it does spin if i bypass everthing using jumpercables

milligan_17

also my replacemnt dme part number is 993.615.227.00 the orignal is 944.615.227.00 so i got one for a 993 911 they had the same prongs so it fit in but the new one is a bit longer anybody know if they function the same

mel_t_vin

You have the correct relay...the 993 part superceded the 944 part several years ago.

There have been a few early-no start threads posted recently. Sounds like you've run leads directly from the battery to the pump, successfully. Have you tried to place a jumper between pin 30 and pin 87b to bypass the DME relay and send power directly to the fuel pump via the car's wiring? If that is not successful, then you could have issues with with the relay board, the ignition switch, or the wiring to the pump.

I would start by looking at the wire ends at the fuel pump and, if questionable, strip a few mm's of wire and re-attach the connector's.

milligan_17

I have seen this mentioned before in other threads but honestly wiring and electrical are not my strong suit where are pin 30 and pin 87b located and when you say wire just a non-resistance wire like copper?

william_b_noble

if you are not comfortable with the terms in the post above, have someone with you who understands the post - I'm not trying to be insulting, but if you really don't understand that you can make a mistake and make matters worse

milligan_17

I did then pin test and have come to the conclusion that my reference sensors are bad i know there bmw makes a senors that fits over to the 944 but does anybody know if Mercedes makes one and the part number?