Will not stay running more than two to three seconds?

DWBACHARACH

MEMBER
1983 MERCEDES BENZ 380SL
V8
2WD
AUTOMATIC
150,000 MILES

After rebuilding fuel delivery system, replacing injectors, cleaning fuel lines from distributor to injectors, adding new plugs and wire set, the car will start, but only runs for a few seconds. Not sure what my next step(s) should be to address this issue. Thanks, Dave

6 Replies

KASEKENNY

MECHANIC
18,907 POSTS

This sounds like a fuel issue so we need to start with checking fuel pressure and finding out what it is. Especially since you just did all this work to the fuel system.

Here is a guide that will help with step by step instructions on this:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Next here is a guide that helps with this issue in more general terms:

https://www.2carpros.com/articles/stall-at-idle

Let's start with this info and go from there because once we find out the fuel pressure, I suspect we are going to be onto our issue.

Thanks

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Tuesday, June 22nd, 2021 AT 5:56 PM

DWBACHARACH

MEMBER
4 POSTS

Thanks. Not sure where to attach the pressure gauge. There is no port on the fuel distributor and there is no pressure port on any line in an old car like this. Should I attach it on the line from the fuel pump before the distributor? Inline near the idle control module or the cold start control? Thanks.

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Thursday, June 24th, 2021 AT 10:26 AM

KASEKENNY

MECHANIC
18,907 POSTS

Unfortunately these are not easiest to test this pressure as you have to have basically separate a connection point and put in a T system as shown in the diagrams below.

These are not the best pictures but basically you have to pick any hard line connection point and put this set up in so that you can connect the gauge.

Images (Click to make bigger)