How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask David Gieswein Your Own Question
David Gieswein
David Gieswein,
Category: Porsche
Satisfied Customers: 49
Experience:  Automotive technician at Doug Gray Dodge/Chrysler/Jeep
Type Your Porsche Question Here...
David Gieswein is online now
A new question is answered every 9 seconds

I have two fuel pumps working on 1978porsche 928 CFI

Customer Question

I have two fuel pumps working on 1978porsche 928 CFI injection one # is(###) ###-####the other is SJ910-3805
Submitted: 24 days ago.
Category: Porsche
Expert:  David Gieswein replied 23 days ago.

Hello my name is ***** ***** maybe I can help. I own a 1978 Porsche 928 in which I have done much work to. Perhaps I may be able to help you. What is your question.

Customer: replied 23 days ago.

Hello David

I have two fuel pumps new I put one on and the car will not start havent checked the Pressure yet.but there is no fuel at the warm up regular. not sure this pump is for hi pressure that this system needs to operate bought these off Ebay they are new one is #0580254984 the other is #SJ910-3805

Expert:  David Gieswein replied 23 days ago.

I too only am using one fuel pump and I also bought it off ebay. I cant tell you right now what the p/n is until I get off work. I the meantime, I believe the fuel comes up to the engine to the fuel distributor first. There is a small screen in the inlet of the fuel distributor you need to check. Also while you are checking this, check that fuel comes out of this line by cycling the key or trying to crank the engine. I will give you what I know off hand first, when I get off work I can really help you

Expert:  David Gieswein replied 23 days ago.

Are you still there? I replied but did not get a response.

Expert:  David Gieswein replied 22 days ago.

Do to a no response condition from the customer I am opting out.

Customer: replied 20 days ago.

I went ahead and put a gauge on the output line and there is 85 pounds there so I will look some where else. Thanks For your help

Ed Doherty

Expert:  David Gieswein replied 19 days ago.

Do you still want help on this issue?

Customer: replied 15 days ago.

I have a follow up question that you are the only one that can help you will have to look on your car the 1978 928. Coming out of the center of the fuel distributor that line goes to a vacuum regulator I think its a regulator the output of that regulator goes to the input of the warm up regulator. the vacuum regulator has a place for a vacuum line to be attached mine does not have a vacuum hose on it should there be a hose on that regulator. If we could talk i could explain it better.

Ed Doherty

(###) ###-####/p>


Expert:  David Gieswein replied 14 days ago.

I can talk later tonight if you like. I am at work right now. I get off at 6pm central time. I will contact you then if you like.

Expert:  David Gieswein replied 12 days ago.

If you need assistance I am willing to help you, but you must rate me first. I don't work for free. My time is very valuable. If you rate me I will call you and give you the info you need. Sorry to be so blunt but I have been getting a slew of customers lately that get their answer and then don't pay. I don't get paid until you rate me.

Expert:  David Gieswein replied 12 days ago.