What are people using to replace their Digiplex?

Additionally, first thing in the morning there is no starting problem

 

As I indicated, the first cold start is different than a warm restart.

 

See page D8 in the 281/83 Mondial8/QV WSM which shows the red supply pressure path and green control pressure path:

For the red supply pressure path, the fitting at the cold start injector is a convenient place to measure (or where the red lines connect to the fuel distributor).

For the green control pressure path, the center port of the fuel distributor or where that line connects to the WUR.

 

Thanks Steve, I will check these areas out. This vehicle was taken apart long before I was given it to work on, so I'm definitely in the dark on the original running condition. I do know that the fuel pump. fuel filter and accumulator are new, as I've just replaced them per manager instruction. Could this be because of a faulty distributor or WUR?

I will be testing pressures shortly

 

If you mean the warm restart difficulty, there is another possible cause if the fuel supply pressure is falling too rapidly at warm engine shutoff -- a bad o-ring on the end of the plunger in the fuel pressure regulator section of the fuel distributor. However, a new fuel pump doesn't mean the check valve inside it is OK -- actually, on this point, people have wrongly replaced the older-style long-nose fuel pump (with the internal check valve) with the later-style short-nose fuel pump and left the check valve out completely. Can you post a picture of the fuel pump?

 

https://awitalian.com/product/ferrari-308-328-mondial-fuel-pump-113976a.html/

This is the BOSCH replacement that we got

 

Doesn't look to me like that pump has an internal check valve, but I don't know it (and that's a smaller 52mm diameter pump). The Bosch fuel pump styles that I know of are:

Bosch 59623 (has the internal check valve -- note the fixed long-nose):
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Bosch 59632 (uses an external check valve that screws into the short-nose):
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First, make the supply fuel pressure measurement at warm shut-off to see if you are chasing the right problem.

 

Need to post a correction (as I transposed some digits in those Bosch part numbers):

Bosch 69523 has the built-in check valve (and uses the threaded union fitting to connect the output line).

Bosch 69532 has the screw-in external check valve (and uses a banjo fitting to connect the output line).

Is there any part number shown on the body of the fuel pump that you got from AW Italian?

 

BOSCH 69896

 

Can't find anything definitive about whether Bosch 69896 has a built-in check valve, or not, but its short-nose structure would suggest to me that it doesn't. Can you post a picture of your actual fuel pump installation to show the plumbing from the fuel pump outlet to the accumulator inlet to see if anything "custom" was done? But the bottom line is still to measure the fuel pressure at warm engine shutoff.

 

Steve, the threaded connection from the fuel pump is attached to the upper fitting of the accumulator, jus
t like it was with the original components

 

Hi there Folks. Hate reviving an old thread, but I feel I need to, unfortunately. This is the fuel pump my employer was told, by Ricambi, is a direct replacement for the original tall tower pump that was originally in the vehicle. The Bosch part number is 0 580 464 125 and the Ricambi catalog part number for this is 121727, which they're saying will work, but I am unsure based on original configuration.

The original Ferrari pump part number is 113976, BOSCH oem # 0 580 254 975.

Looking at this pump, I do not know if this is going to work.. Can someone confirm that this pump will actually work?



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That later 0580464125 fuel pump can be used as a substitute for the later 121727 / 050254947 / 69532 fuel pump (although it can be marginal at high RPM especially on the 3.2L motors), but it can only be used to replace the 113976 / 0580254975 / 69523 fuel pump if you make changes to the plumbing to have a banjo fitting on the hose connected to the output of the fuel pump to be able to attach to the external check valve of later style Bosch CIS fuel pump.

However, you should actually confirm what fuel pump you have now -- many of the early F CIS car have been updated (i.e., plumbing already changed) to the later fuel pump (when the earlier fuel pump was not available for many years). Post a pic of your existing fuel pump, and it will be obvious which one you have.

Try an internet search on Bosch 69523 (which is the Bosch 0580254975 / 113976). Don't know if they really have 69523 available, but O'Reilly's shows it:

https://www.oreillyauto.com/detail/c/bosch/bosch-electric-fuel-pump/bos0/69523

See this thread for examples of how to change the plumbing to put the later style 69532 fuel pump on a car that has the earlier 69523 fuel pump:

https://www.ferrarichat.com/forum/threads/fuel-pump-replacement.704024/#post-150038279

 

Leigh: Have you seen this F-chat post? It discusses Bosch 0 580 464 125 and alternatives in some detail.

 

Just getting back to this.
Yes, I have seen that on. I am going under the recommendation that I was given 113976. Lets hope this works