Question about 1991 Ford F350

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What does the vacuum pump on an 91' f350 (7.3l diesel) run?

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Good question. On petrol engines there is a throttle plate that governs the amount of air entering the engine. At idle the throttle is almost completely closed and a result is the a vacuum is created in the inlet plenum. This vacuum is used to control ancillary engine related functions: opening the engine's exhaust gas recirculation (EGR) valve; operating the intake manifold runner (IMR) valve; moderating the fuel pressure regulator (FPR) function; and in governing in-gear duration (automatic transmission) and vehicle functions such as central locking, fuel cap door release and brake servo assist. OK so what has this to do with diesels? Diesels do not have throttles, engine speed is governed by fuel injection volumes. Without an air throttle the diesel engine does not have a vacuum to run the ancillary vehicular functions. Since many of the ancillary devices have already been made to operate with petrol engines it is simpler add vacuum pump to the diesel engine and use the same components to do the same jobs.

Posted on Nov 15, 2010

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It makes your brakes and cruise control work i just had that fixed on my truck

Posted on Jan 30, 2011

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I have hard break peddle with little breaking power. I checked the vacum pump a found 13 inches of vacum. the hose removed from the vacum booster will **** your finger to it with motor running. the truck...


Hello, Check other Vacuum lines for leaks. If you have a 4x4, they can have Vacuum operated hubs and a leak anywhere will draw down the Vacuum. I found most pumps running at about 21psi. Check for a Vacuum Reservoir. The older models used one looking like a coffee can and they would rust on the bottom and leak.

If you take off a vacuum line and use a hand vacuum pump, you should easily find a leak on one of the remote lines. Another test idea is to remove the Vacuum pump lines, put in soapy water, and pressurize with about 3 PSI. Any vacuum leaks will blow bubbles and soapy fluid. Its your choice on what to do. I would reserve the soapy water for a line I find to leak with a hand Vacuum pump.

Many of the people wih your problem replaced the vacuum pump and were good to go. But if you can measure the vacuum and find the leak, you may save money on a part you do not need.

Jun 08, 2011 | 1996 Ford F350 Crew Cab

2 Answers

I accidentally put diesel into the car, about 10 litres. What do I need to do to rectify this?


Hi, you will need to pump it out. It is best if you can pump it from the fuel rail, so that only a minimal amount would get into the injectors. You can do this by removing the fuel return hose from the fuel pressure regulator and attaching a hose that you will lead to a bucket. With the hose in the bucket, turn the key on so the fuel pump runs. If the fuel pump will not stay on, please get back to me, and I will provide a relay bypass procedure toi keep the pump running. With the pump running, the diesel should come out the return port into the bucket. If it comes out too slowly, try pulling a vacuum on the vacuum hose that's attached to the regulator. You can use your mouth to pull the vacuum if you attach a clean hose. Once you have all of the diesel out, put in some petrol and pump a couple liters of that through as well. Then reconnect the hoses, and the car should start OK. Please let me know if you have questions.

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I have very little rear brakes on my 91 w350. the shoes are fine and so are the wheel cylinders. I have recently replaced the master cylinder and had the system power bled at a shop. Is it the...


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The power steering pump is piggie backed to the vacuum pump. The seal in the back of the vacuum pump has engin oil under presure behind it cousing a leak that gets worse over time. Cummins make a seal kit to fix this leak.

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BRAKES NOT WORKING PROPERLY PEDAL BECOMES HARD MHEN APPLIED AND PUSHES AGAINST PRESSURE


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Toyota Surf 1995 3ltre diesel Vacuum diagram


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My f250 diesel truck air conditioner does not


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Aug 06, 2009 | 1996 Ford F250 Crew Cab

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